How to Change Spark Plugs
- Safety First. Park your vehicle on a flat, dry surface and ensure the engine is cool.
- Remove the Spark Plug Wire.
- Remove the Coil On Plug (COP)
- Unscrew the Spark Plug.
- Put in the New Spark Plugs.
- Re-install the Spark Plug Wires or Ignition Coils (COP)
- Start Up the Engine.
Can I replace my spark plugs myself?
Like rotating tires or changing oil, replacing spark plugs is a job that can be easily, and inexpensively, done in the confines of your own home. Although they don’t need maintenance as often as the other two tasks, spark plugs are equally as important and require consistent monitoring.
Do you need a special tool to change spark plugs?
You’ll need just a few tools to change out the spark plugs on your car. The most important tool is a socket wrench with an extension and a spark plug socket. Spark plug sockets come in two sizes: 5/8 inches and 13/16 inches. Use a torque wrench to make sure you don’t over-tighten your plugs.
How often you should change spark plugs?
And as a general rule, we recommend replacing spark plugs every 30,000 miles, which falls in line with most manufacturers’ recommendations. You can check your owner’s manual or the manufacturer’s website for information specific to your make and model vehicle.
What are signs your spark plugs are bad?
Symptoms of bad spark plugs can include:
- Reduced gas mileage.
- Lack of acceleration.
- Hard starts.
- Engine misfires.
- Rough idling.
What does a tune-up consist of?
Generally, a tune-up consists of checking the engine for parts that need cleaning, fixing, or replacing. Common areas under inspection include filters, spark plugs, belts and hoses, car fluids, rotors, and distributor caps.
Why is my car chugging when I accelerate?
An acceleration problem is usually the result of insufficient fuel, air, or spark during the combustion process. Worn-out spark plugs or the electrical cables attached to them are one of the most common causes of cars stuttering.
Should you disconnect the battery when changing spark plugs?
No. The battery will not cause any problems when changing the plugs. The one thing to avoid is accidentally dropping a tool and having it contact the positive battery terminal and the car body. If this occurs, you will get a spark and possibly blow a fuse.
Do you need a torque wrench to change spark plugs?
Spark plugs should be torqued to manufacturers’ specifications. However, it is possible to tighten the plugs satisfactorily without a torque wrench.
Should you use anti seize on spark plugs?
NGK spark plugs are installed at the factory dry, without lubrication or anti-seize. Anti-seize can act as a lubricant, altering torque values up to 20 percent, increasing the risk of spark plug thread breakage and/or metal shell stretch. Do not use anti-seize or lubricant on NGK spark plugs.
Do new spark plugs make your car faster?
In short, yes, in some situations spark plugs can increase horsepower. These ‘massive’ gains of one or two per cent generally won’t be exceeded, even if you’re replacing really old and worn spark plugs for new ones. In this case, your essentially just restoring your car back to its peak performance.
How do you know when spark plugs need to be changed?
7 Signs You Need to Replace Your Spark Plugs
- The car is hard to start. The battery is often blamed as the culprit for a vehicle not starting.
- The engine misfires.
- The car gets poor fuel economy.
- Rough engine idle.
- Your car struggles to accelerate.
- The engine is really loud.
- Your ‘check engine’ light is on.
Can I drive with a blown out spark plug?
You shouldn’t drive with a blown spark plug and since you probably can’t get it out because the heat has welded the spark plug, you need to remove the coil and the inductor wires from the blown spark plug so that way that particular spark plug is disabled and won’t do damage to the engine.
How do you diagnose spark plug problems?
What are the signs your Spark Plugs are failing?
- Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle.
- Trouble starting. Car won’t start and you’re late for work… Flat battery?
- Engine misfiring.
- Engine surging.
- High fuel consumption.
- Lack of acceleration.
10 Tips For Changing Spark Plugs
Engine difficulties can be caused by worn-out or failed spark plugs, and it should be expected that you will have to replace them at least a few times throughout the course of a vehicle’s life span. Unfortunately, it is a rather uncomplicated DIY project that takes close attention and only a few simple instruments. The appropriate knowledge and a few techniques up your sleeve make replacing spark plugs a simple procedure that has significant benefits in terms of fuel efficiency and performance.
1. Solid Prep
To avoid having to seek for tools in the middle of a work, get all of your supplies together beforehand. Among these are a few specialized instruments, such as a spark plug puller, that will make your life a little simpler. In addition, while it may be tempting to use a conventional socket to remove plugs, a specialist spark plug socket (of the proper size) is the best option since it includes an internal rubber component that protects the fragile ceramic housing throughout the removal process.
2. Keep Your Cool
Always allow your engine to cool completely before commencing work, or you may find yourself in a sticky situation.
3. Keep It Clean
Using a vacuum, suck out any dirt or debris from the region surrounding the spark plug before you begin removing any of them. When the plugs are removed from the engine, the purpose is to prevent dirt from entering the combustion chambers. You may also consider bringing a little amount of carb cleaner merely to create an extremely clean work surface that won’t spill grime on you if you hit it while working.
4. Go to Your Home
If you need to remove anything, such as vacuum hoses, coils, or other components that may be easily misplaced, name them before disconnecting them so that they can be reconnected quickly.
5. One by One
Plugs should be removed and replaced one at a time. If you do this now, you will avoid the frustration of having to figure out where each wire goes later on.
6. Gadget Inspector
As each plug is being removed, make sure to inspect it. Examine the engine for signs of excessive carbon buildup, oil, unburned gasoline, or damage to detect previously undiscovered engine issues. Any of these signs point to a more serious condition that needs to be addressed as soon as possible.
7. Mind the Gap
In today’s world, most plugs are pre-gapped, but you should check to make sure the gap is proper using a gauge (carefully, especially if the plug is iridium) and that there is no prior damage.
8. Keeping the Spark Alive
In today’s world, most plugs are pre-gapped, but you should check to make sure the gap is proper using a gauge (carefully, especially if the plug is iridium) and that there is no prior damage before using it.
9. Sparking Joy
Most plugs these days are pre-gapped, but you’ll want to check to make sure the gap is proper using a gauge (carefully, especially if it’s iridium) and that there is no prior damage.
10. Well Adjusted
When the wires are put on the new plugs, check to see that they are completely seated. You’ll hear a little pop to let you know they’ve made it in.
If you have a coil-on-plug ignition system, you should take advantage of this chance to replace the coil-on-plug boot (where applicable). Because you’ve already completed the majority of the job, it’s an excellent “may as well” item. It’s as simple as that! You may complete it as a fast afternoon project at home to keep your engine in good working order. Take a look at all of the electricalignment systemproducts available on NAPA Online or visit one of our 17,000 NAPA AutoCare facilities for regular maintenance and repairs.
More information on replacing spark plugs may be obtained by consulting a trained professional at your local NAPA AUTO PARTS shop. Blair Lampe provided the photographs.
Blair LampeView All
Blair Lampe is a professional mechanic, blogger, theater technician, and wordsmith residing in New York City’s Flatiron District. Backpacking anywhere her boots will take her, rock climbing, experimental theater, a fresh rosé wine, and showering love on her 2001 Sierra truck are some of her favorite pastimes in her spare time.
How to Replace Spark Plugs in Your Car
Time a few of hours Complexity BeginnerCost$20-50
The process of changing spark plugs takes around one hour (for a four-cylinder engine) and will save you at least one hundred dollars in labor costs if you do it yourself. In the majority of situations, it’s a straightforward procedure that will help you retain top performance and the best gas economy possible.
When a spark leaps the distance between two electrodes, it actually burns off (erodes) tiny bits of metal from each of the electrodes in the process. Over time, the distance between the two points widens to the point that the spark is unable to complete the leap. Misfires, decreased gas mileage, sluggish acceleration, and, finally, the dreaded “Check Engine” light are all signs that something is wrong.
When to CheckChange a Spark Plug
It should be noted that not all spark plugs have a 100,000-mile rating. In fact, several automobile manufacturers advocate replacing the transmission every 30,000 miles. Whether determining when to change spark plugs, always refer to your owner’s handbook for the recommended service intervals for your vehicle. For those who can’t recall the last time they replaced their spark plugs, they may be removed and checked for gap and condition. Having invested the time and effort to begin inspecting spark plugs, you may as well replace them and create a new baseline for the future while you are already at it.
Signs of a Bad Spark Plug
In contrast to the manufacturers’ advice for oil changes, which tend to be unduly conservative, the recommendations for how often to change spark plugs are frequently overly enthusiastic. For example, if you have 80,000 miles on a set of 100,000-mile plugs, they are 80 percent worn and are beginning to have an impact on the performance of the engine and the efficiency of the fuel system. Even worse, after so many kilometers, there is a lot of spark plug wear, and spark plugs have a tendency to seize in the cylinder head as a result of this.
So, what exactly are the advantages of upgrading your spark plugs?
Do it Yourself or Take it to a Pro?
The answer is dependent on the sort of engine that is installed in your car. It may be necessary to remove pieces of the intake manifold in order to replace the spark plugs on some V-6 vehicles. You should take your car to a professional if you aren’t comfortable doing it. However, if your engine has simple access to the back bank, you should be able to do the procedure on your own. Simply ensure that the spark plugs are correctly gapped and that a torque wrench is used. The tools displayed may be purchased from internet providers and car parts retailers.
Request from the cashier the spark plug gap and torque specs for your car while you’re there while you’re waiting. In addition, purchase a little package of dielectric grease. Before scheduling an appointment, it’s also a good idea to find out how much a spark plug replacement would cost. Step No. 2
Open Up and Clean Your Work Area
First, remove the plastic “vanity” cover (if installed) and the air filter assembly from the top of the engine, then proceed to the bottom of the engine.
- Any vacuum hoses you remove should be labeled so that they can be returned to their proper location.
- Pro tip: Before you remove any additional pieces from a four-cylinder engine, become familiar with the top of the engine or the banks of a “V” engine.
- In order to prevent dirt from entering the cylinders, blow compressed air around the ignition coils. After that, blow any loose dirt off the engine before putting your tools and fresh plugs on the bench.
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Remove the Ignition Coil and/or Boot
- Professionally complete your home improvement projects! Become a subscriber to our mailing list! It’s important to do things right the first time. Three-pointed strategy
- Some COP systems come with a removable rubber boot and spring, which is a good idea. Remove them with needle-nose pliers if they don’t come out with the coil, and replace them with new components if they don’t. After that, take out the old spark plug.
It is possible that your vehicle does not have COP ignition since the spark plug wire will terminate in a boot that connects to the spark plug. A spark plug wire puller makes it simple to remove the boot from the plug. Step number four.
Unscrew the Plug
- The spark plug wire will come to an end in a boot that attaches to the spark plug if your automobile is not equipped with COP ignition. The boot may be removed with the use of a spark plug wire puller. 4) The fourth step.
- Advice from the experts: A swivel head spark plug socket makes the process considerably simpler. To reach the plug, you’ll most likely need to use an extension cord of some length.
- Observer’s tip: Not all engines leave the plugs as easily accessible as the one seen. The more confined the engine compartment, the more difficult it will be to reach the spark plugs and other components. However, all of the plugs may be removed.
How To Gap a Spark Plug
Before installing any plugs, make sure they are all gapped according to the manufacturer’s specifications. Before inserting a spark plug, make sure the spacing between the two electrodes is correct.
- The right wire gauge (orgap gauge) should be inserted between the electrodes. The wire should dangle between them just a little bit. If the gap is too tiny, open it with the gap gauge by prying it open
- If the gap is too large, open it with the gap gauge by prying it open
- If the gap is excessively big, softly tap the side electrode on a firm surface. Apply a little dab of anti-seize compound to the threads of the plug and manually thread the plug into the cylinder head
Install the New Plug
The right wire gauge (orgap gauge) should be placed between the electrodes. When the wire is between them, it should drag somewhat. Pry up the gap with the gap gauge if it’s too little; if it’s too big, use the gap gauge to open it. To reduce the gap size, softly tap the side electrode on a firm surface. Apply a little dab of anti-seize compound to the threads of the plug and manually thread the plug into the cylinder head.
- Always use a torque wrench and the spark plug torque specifications recommended by the manufacturer. An insufficient amount of torque can result in a plug blowing straight out of its threads and out of the cylinder head altogether. Too much torque causes the plug to deform
- If you apply an anti-seize compound on the plug threads, you may lower the torque by 10%. If you do not have access to an atorque wrench, visit the website of the spark plug manufacturer to learn about manual tightening procedures and spark plug torque specifications.
Lube the Spark Plug Boot and Button It Up
- Before replacing the coil, apply a small layer of dielectric grease around the inside of the spark plug boot. Using oil will help to prevent misfires in the future and also make removing the boot easier in the future. Install the ignition coil, hold-down bolt, and electrical connector for the coil again. Reinstall the air filter and vanity cover, then turn on the machine.
Note: The same method should be used for non-COP ignition system booting.
How To Change Spark Plugs
If you purchase a product after clicking on one of our affiliate links, The Drive and its partners may get a commission. More information may be found here. In the same way that rotating tires and changing oil are simple and affordable tasks that can be completed in the comfort of your own home, replacing spark plugs is no exception. Spark plugs are equally as critical as the other two chores and require constant monitoring, despite the fact that they do not require maintenance as frequently as the other two tasks.
Spark plugs are simple plug-and-play devices if you have the necessary gear and the assistance of your favorite instructional team (hint, wink).
Spark Plug Basics
Time required: Half an hour to three hours, depending on the placement of the plug. Beginner’s level of ability Engine is a vehicle’s primary system.
What Is a Spark Plug?
A spark plug is an important element in the ignition system of a car. When a small, insulated device is used to generate a tiny spark within a combustion chamber, it is protected from the elements by a metal casing. This is accomplished by creating a spark between a center electrode and a ground electrode, which ignites the air and fuel combination within the cylinder and, with a poof, you’ve got ignition.
Various types of materials are used in the production of spark plugs. Copper, nickel, iridium, and platinum are the most commonly used metals in the most popular varieties, but to varied degrees. Ceramics are employed in spark plugs as insulators and protectors, among other things.
Spark Plug Replacement Safety
If you’re working on your automobile, it may be risky and nasty, so make sure you have everything you need to avoid getting hurt and/or losing a finger while doing so.
- Microfiber towels for the car’s body to keep it from becoming scratched Gloves for mechanics
- Safety glasses
The most essential thing to remember about spark plug replacement is that it must be done with the car off and properly cooled down.
Everything You’ll Need To Change Spark Plugs
Given that we are not psychics, nor are we prying into your toolbox or garage, we’ve compiled a list of everything you’ll need to get the task done.
- If necessary, a flexible socket wrench joint adapter can be used in conjunction with a ratcheting socketwrench and a socket wrench extension. a gapping tool for spark plugs
- Wrench for tightening a screw
- Cleaning supplies such as a vacuum and/or compressed air blower
- Cleanrags or paper towels
- A set of spark plugs having anti-seize qualities (no anti-seize lubricant is required with these plugs)
It will save you valuable time if you organize your tools and equipment for changing your spark plugs so that everything is conveniently accessible. This will eliminate the need to wait for your handy youngster or four-legged assistant to bring you the sandpaper or blowtorch. (You will not require a blowtorch for this task.) Please do not allow your child to hand you a blowtorch—Ed.) To repair your spark plugs, you’ll also need a flat workplace, such as a garage floor, driveway, or street parking lot that is also well-ventilated.
Here’s How To Change Spark Plugs
Let’s get this done! Remove the Spark Plugs from the ignition system
- Disconnect the negative battery terminal and, if required, remove any protective coverings. The region surrounding the spark plugs should be cleaned with a vacuum and a blower to prevent dirt and grime from dropping into the spark plug pocket or the engine. Remove the spark plug boots one at a time from the spark plugs. Fires in the engine occur in a precise order, and it is critical that this order be maintained. As you work, use a marking device such as masking tape to identify which wires belong to which plugs. Remove the spark plugs one at a time and check them for damage, buildup, or foreign materials
- Then replace them.
Performing a visual inspection of the spark plugs
- Because of regular wear and tear, all spark plugs will get somewhat darker in color with a black or brown tint to them. However, watch for carbon build-up, oil, or gasoline on the plug. If any of these symptoms are present, it is possible that the underlying cause is a more serious problem that requires additional investigation. Make that the central electrode is working properly. If it is still somewhat even and appropriately formed, it is possible that it will not need to be repaired. While spark plugs are very affordable and essential to a vehicle’s health, it is important to change them within the recommended maintenance window, regardless of how the plug appears. If the plug is still in good condition and you decide to keep it, use the gap measurement instrument to verify the spark plug gap. Check the handbook for the appropriate gap and make the necessary adjustments. When narrowing the gap, avoid using a hammer or hitting it against a particularly hard surface. Use a light tap on anything soft, such as an instruction manual or a towel draped over a hard surface. Using a nonmetallic brush, gently scrub the spark plug, then spray it with brake or carburetor cleaner and wipe it dry when it has been cleaned. Use of a sandblaster is not recommended. Alternatively, if the plugs are damaged or too old, they should be discarded and replaced with new plugs.
New Spark Plugs are being installed.
- Despite the fact that most current spark plugs come with a pre-set gap from the factory, it never hurts to double-check and adjust the gap using the gap tool
- The replacement plugs should be hand-threaded in to the engine with the help of the plug starter or the socket extension (the spark plug sockets are often equipped with magnets or rubber boots to retain the spark plug). If it’s too difficult, take it back out and try it again later. To cross-thread the plug or over torque is the very last thing you want to do. For your car, look up the torque specification and use a torque wrench to tighten the spark plugs. Reattach the plug boots to the plug mates that were originally attached to them. Reconnect the battery if necessary.
That’s all there is to it; congratulations!
Get Help With Spark Plugs From a Mechanic On JustAnswer
The Driver understands that, despite the fact that our How-To guides are comprehensive and easy to follow, a rusted bolt, an engine component not in the proper place, or oil gushing everywhere can cause a project to go awry. So we’ve joined with JustAnswer, which links you to licensed mechanics all around the world to help you get through even the most difficult projects on time and on budget. So, if you have a query or are stuck, go here to speak with a mechanic in your local area.
Possible Symptoms of Faulty Spark Plugs
A number of the most typical symptoms of defective spark plugs are listed below.
- The automobile is having difficulty starting
- The engine is making a banging or pinging sound
- This is normal. A harsh idle may be heard throughout the automobile. The performance is muffled or uneven in nature. There is a noticeable decrease in fuel economy.
How Often Do You Need To Change Spark Plugs?
According to the manufacturer, spark plugs should be changed every 30,000 miles on average, however this might vary between 20,000 and 40,000 miles depending on the vehicle. Refer to your vehicle’s owner’s handbook for particular information regarding your vehicle, and use your best judgment when examining the plugs to decide whether or not they need to be changed. If the plugs have become corroded, it is time to replace them.
How Much Does It Cost To Change Spark Plugs?
An average single spark plug can cost anywhere from $2 and $20 on regular consumer automobiles, as opposed to performance-oriented racecars.
Pro Tips To Change Spark Plugs
During our interview with Justin Wolf, Senior Product Manager of Bosch Spark Plugs, we discussed what a beginner should know before attempting the job of changing spark plugs. Here are some of his best advice for do-it-yourselfers:
- “The most essential thing to remember is to always replace parts in accordance with the manufacturer’s recommendations.” A step-by-step guide on how to properly fix your automobile.” Preventing downgrade in metallurgy is critical – if your automobile came with an Iridium spark plug, don’t use a platinum or copper replacement
- “Mishandling the spark plug might cause damage to the electrodes or ceramic.”
- “Complete one cylinder at a time to prevent mixing coils and spark plug wires.”
- Take your time and avoid hurrying the repair in order to obtain the best results.”
- “The most frequent error people make is overtorquing or overtightening spark plugs.”
- “The most common mistake people make is overtorquing or overtightening spark plugs.”
Life Hacks To Change Spark Plugs
Because you may not have access to the proper equipment or a buddy who has the wrench you require, we’ve created a list of our favorite hacks to make your life simpler while draining your bank account as little as possible.
- Alternatively, if you do not have a plug starter or a socket that grips or holds the plug, you can use a spare rubber hose if it is the proper size to grab the plug. It is also possible to use long-nose pliers, provided that you take care not to harm the top of the spark plug when inserting them.
How to Change Your Spark Plugs
Spark plugs are a crucial component in the function of your engine. When your engine starts, it is the spark that initiates the ignition cycle, which is what allows the engine to run. After a period of time, spark plugs begin to wear out and must be changed. If your car’s tires are in need of replacement and you want to perform the work yourself, you’ve come to the perfect spot. To discover the proper approach to change spark plugs effectively and safely, RoadTrack spoke with Kevin Hines, senior technician at McLaren Philadelphia, in an interview for this article.
He’s the only one who knows how to replace out plugs, so trust him.
Before continuing, we recommend that you review your car’s owner’s handbook for specific instructions on how to change the spark plugs in your vehicle before continuing. It is possible that the manufacturer’s recommendations will differ from the following guidelines.
Getting the Right Parts
In some cases, there are hundreds of different spark plug manufacturers to pick from, depending on the vehicle you drive. Selecting the most appropriate option is entirely up to you. For the vast majority of autos, Hines strongly advises purchasing a set of plugs directly from the car’s original manufacturer. It was initially intended for use with your motor, and these are the plugs that were used. If you want to save money, you could get a set from the manufacturer’s supplier. You’ll also want to make certain that the spark plugs you purchase are properly gapped.
- “Because every engine is different, it’s important to research your manufacturer’s specs and understand how to properly space spark plugs.” Although gapping spark plugs may appear to be a complicated procedure, it is actually rather easy.
- Even if your plugs are “pre-gapped,” we recommend utilizing a tool to double-check and ensure that they are.
- If you manage to drop one of your new plugs by accident, what should you do?
- It’s possible to have hairline cracks in the porcelain, which can lead to a slew of issues that take an eternity to resolve, according to him.
The Tools You’ll Need
To replace out your plugs, you’ll just need a handful of simple tools at the very least. A ratchet, a couple of extensions, and a spark plug socket designed specifically for your vehicle will be quite useful in making the removal and installation of your plugs a breeze. It is possible to get the socket for a reasonable price both online and at most auto parts stores. If at all feasible, we recommend keeping a torque wrench on hand as well. As a precaution, make sure you have the tools necessary to remove any accessories or trim pieces from your engine bay that may be in the way of accessing the spark plug.
How to Change Your Spark Plugs
Once you have all of the equipment you’ll need, as well as the new plugs, you’ll need to determine out how you’re going to get to the spark plugs in your automobile. Many modern automobiles feature decorative trim pieces or other objects such as air intake boxes, coolant overflow tanks, wiring, windshield washer fluid tanks, or other elements that get in the way of the driving experience. After you’ve resolved the first problem, you may proceed to the wiring. The majority of spark plugs receive their power either through plug wires or coil packs.
- When using coil packs, each cylinder has its own separate coil, which is located on top of the spark plug and is connected to the battery.
- On some automobiles, the wires or packs may be removed by hand without the need of tools.
- It is your responsibility to determine how your vehicle is constructed to gain access to the plugs.
- We recommend that you vacuum the area around them, especially the recesses where the spark plugs are located, before attempting to remove them with a socket.
- After you have removed the plugs, the last thing you want is for debris to enter the system.
- Once you’ve obtained the proper socket, you’ll almost certainly want an extension, depending on the location of the plug in relation to the size of your engine.
- After you’ve removed the plugs, have a look at them.
The condition of your spark plugs can provide you with information about how well your engine is performing.
Always thread them in by hand; the last thing you want is to harm the threads on your engine by using a machine.
Torque wrenches, on the other hand, are pricey, so if you don’t have one, that’s OK.
Overtightening a spark plug in an aluminum head can result in serious thread damage and should be avoided.
As a precautionary measure, Hines suggests dabbing a little amount of dielectric grease between the plug and the wire to guarantee a stable electrical connection.
“Check to see whether you can click on and feel the connection before continuing.” Installing the wires or coils allows you to reattach any trim pieces or other things that were previously preventing you from getting to the spark plugs and other components.
If this is the case, you’re finished!
Congratulations! This material was generated and maintained by a third party and imported onto this website in order to assist users in providing their email addresses for further consideration. You may be able to discover further information on this and other related items at the website piano.io.
Changing Spark Plugs: What You Need to Know Before You Attempt to DIY
1/4Photo courtesy of Shutterstock
Why Replace Your Spark Plugs?
The spark plugs in your car’s engine are the beating heart of the vehicle. Every 30 months or 48,000 kilometers, or whichever comes first, your spark plugs should be changed to ensure optimal fuel economy and engine performance. (For additional professional tips on how to obtain better gas economy, see this article.)
Do you have the right tools and equipment?
For starters, you’ll want to make sure you have the following items on hand before you begin changing the spark plugs:
- A spark plug wrench, or a spark plug socket and ratchet are also acceptable options. A gap gauge for the spark plugs
- A torque wrench
- A rag or brush
- Rubber hose measuring 5/16′′ in diameter and roughly 6′′ in length
Check out this list of 20 more items that no home mechanic should be without. 2/4 Photo courtesy of NAPA Canada
How to Remove Spark Plugs
- Prior to removing the old plugs, make sure that the engine has totally cooled
- Before installing the new plugs, make sure they have the right space. It is possible to find the proper spacing for your engine in the owner’s handbook
- Nevertheless Remove and replace each spark plug wire one at a time to avoid mixing them up, or identify each wire with tape to prevent this from happening. Pulling the rubber boot off the end of the spark plug wire with care will allow you to remove the spark plug wire from the spark plug. It is not necessary to pull the wire itself. If the boot becomes stuck, use a twisting motion to remove the boot and plug wire from the boot. Remove the old plug and any debris from the surrounding area with a cloth or tiny brush. When the stopper is removed, any foreign material that would fall into the cylinder will be prevented from entering. To remove the plug, crank it counter-clockwise with a spark plug wrench until it pops out. If necessary, a tiny quantity of penetrating oil might be used to assist in the removal process.
Learn about the 13 things you should never do to your automobile in this article. 3/4 Photo courtesy of NAPA Canada
Adjusting the Gap of the New Spark Plug
- With the use of a spark plug gap gauge, set the recommended gap in the new plug. Using the appropriate thickness wire or feeler, connect the inner and outer electrodes at the tip of the plug’s tip. When the electrodes are suitably gapped, the wire or feeler should be able to glide between them with only a tiny pull. As previously stated, if the gap is not correct, gently bend the outer electrode slightly until the proper gap is reached (see above). It is important to ensure that the outer electrode is centered exactly above the inner electrode.
Visually inspect the cylinder head threads…
They should be in good working order and clean at all times. By hand, the replacement spark plug should be able to easily be screwed into the cylinder head. Any binding of the plug is a sign that there is an issue with the system. Removing the plug and inspecting the threads is a good idea. Here are some more typical automotive problems, as well as instructions on how to solve them. 4/4 Image courtesy of Shutterstock
How to Install Spark Plugs
- Check to see that the region surrounding the spark plug port is free of debris. Make a thorough wipe of the seat to ensure that the new plug and the seat make adequate contact with one another. To install the plug, insert it into the spark plug hole with your hand and tighten it with a clockwise rotation. After you’ve manually installed the plug as far as it will go, use a spark plug wrench or socket to securely tighten it in place. But keep in mind: don’t overtighten the strap! Only if the spark plug and cylinder head threads are clean and dry will you be able to obtain an accurate torque reading. Reattach the plug wire to the new plug using the same method as before. Use a twisting motion on the boot until it’s securely set on the top of the plug
Here are another 100 automobile fixes that you can perform on your own. Visit NAPA Canada for even more helpful hints on how to maintain your vehicle and where to obtain the components you require. First published on December 9, 2020.
How to Change Spark Plugs in a Car
Article in PDF format Article in PDF format Cars run on what are effectively controlled bursts of energy, which are in part regulated by the spark plugs in the engine. The electrical current from the ignition is channeled via the spark plugs, igniting the gasoline. It is a fundamental component of every functioning combustion engine, as well as of all contemporary automobiles. The same as everything else, they eventually wear down and become a reasonably simple issue on your automobile that you can learn to identify and cure with the appropriate equipment and the necessary know-how over time.
To learn how to simply change spark plugs on your car, follow the instructions outlined in the following section.
- Step 1: Identify the spark plugs in your vehicle. The engine compartment should be visible when you open the hood or bonnet of your automobile, and it should be comprised of a bundle of 4-8 wires that lead to various locations around the vehicle. At the engine end of these wires, behind the plug covers that secure them to the engine, are the spark plugs that produce electricity.
- In your automobile, look for the spark plugs first. You should observe a bundle of 4-8 wires running to various spots on the engine compartment when you open the hood or bonnet of your vehicle. At the engine end of these wires, behind the plug covers that secure them to the engine, are the spark plugs.
- 2 Allow the engine to cool completely before removing the spark plugs. If you’ve been driving the automobile for a long period of time, the plugs, as well as the entire engine and exhaust system manifold, might become quite hot. Remove them only when the engine has cooled down sufficiently to be touched. While you’re waiting for your engine to cool down, you should assemble your tools in the meanwhile. To change your spark plugs, you’ll need the following tools:
- A socket drive wrench with a ratchet
- A bar that extends beyond the table
- In most ratchet socket sets, you’ll find a spark plug socket as part of the package. A spark gap gauge, often known as a feeler gauge, which can be purchased at any auto parts store
- s3 Remove the first spark plug from the ignition system. Pull the wire plug from the engine by grasping it as near to the bottom as possible and moving it gently and carefully off the engine to reveal the spark plug, then replace the wire plug. Unless you want to end up with a bigger task on your hands and a broken spark plug lead, refrain from yanking on the wire to take it out of the plug. Connect your socket wrench to the extension bar, and then use the ratchet to carefully and gently remove the spark plug from its housing
- s3 The first spark plug should be removed. Using your fingers, slowly and carefully pull the wire plug from the engine, keeping it as close to the bottom as possible while pulling it off to reveal the spark plug. Unless you want to end up with a bigger task on your hands and a broken spark plug lead, refrain from yanking on the wire to get it out of the plug. Use a ratchet to remove the spark plug from its housing gently and with safety, after attaching your socket wrench to the extension bar.
- s3 Remove the first spark plug from the engine. Using your fingers, slowly and carefully pull the wire plug from the engine, grasping it as near to the bottom as possible, then pulling it off to reveal the spark plug. Unless you want to end up with a bigger task on your hands and a destroyed spark plug lead, refrain from yanking on the wire to take it out of the socket. Attach your socket wrench to the extension bar, and then use the ratchet to carefully and gently remove the spark plug from its housing
- For spark plug gaps that are significantly higher than they should be, but which are still of relatively high quality and which are adjustable-gap plugs, you can either attempt to change the gap by gently tapping the plug on a wooden surface with the gauge in between each plug gap until it is set at its proper distance, or you can simply purchase new plugs. In most cases, it is advised that you change your spark plugs after 20,000 kilometers or 12,000 miles, or as specified in your vehicle owner’s handbook. Inexpensive spark plugs are essential for trouble-free operation and a suitable spark. It is recommended that they be replaced at regular intervals to ensure trouble-free operation and a proper spark. Investment in adequate tools and equipment, such as a fine gap checker, is recommended if you want to begin performing your own plug changes. You may just use it to determine whether or not the electrodes are close enough to each other to ignite correctly. They are even more accurate and have a larger variety of applications than traditional gauges. Same applies for parts: always choose for high-quality and/or authentic components
- The extra money spent on peace of mind and dependability is well worth it
- 5 Examine the condition of the existing plugs. If you notice any white, limey buildup around the electrodes of the plugs or if there is any evidence of burning or parts of the electrode missing, you should replace your spark plugs. However, if you notice any evidence of burning or parts of the electrode missing, you should replace your spark plugs immediately. It is also possible that you need to replace your plugs because of the heavy sooty build-up.
- It is possible that your engine is experiencing a technical problem if your plugs are bent, black, or damaged
- In this case, you should visit a trained technician or your local auto dealer repair shop as soon as possible
- 1 Obtain the appropriate replacement plugs. You may either reference your owner’s handbook or the booklet available at your local auto parts store that matches to your vehicle’s specific make, model, and year of production for assistance. There are literally hundreds of different combinations of spark plugs and measures available, with prices ranging from less than two dollars to more than fifteen dollars for spark plugs made of platinum, yttrium, and iridium, among other metals and alloys. Plugs composed of precious metals (such as iridium and platinum) are often more expensive than plugs made of lesser metals (such as copper), but the coatings on precious metal plugs are significantly more resistant to wear. If you are unsure, consult your auto parts store for guidance, or consult the spare parts department of your local vehicle dealership for original equipment plugs.
- A good rule of thumb is to get the same type of plugs that you presently have in your vehicle. Never downgrade to a less costly plug, and don’t spend too much time trying to fix something that is already functioning well. Because those plugs were installed by the manufacturer for a very good reason, simplify the procedure by using the same ones wherever feasible, provided they were the proper ones installed! Consult your handbook or your local dealer for further information. Because you may often purchase either fixed gap or adjustable gap spark plugs, you can choose whether or not to inspect your plugs on a regular basis and make minute modifications. If you do, you should invest in adjustable plugs. All of this is important, but you also need to make sure that the gap measurement is accurate for your vehicle. You will know for certain if you do your own investigation. Remove it from the package and perform a fast measurement check to ensure that the measurement is correct
- 2. Before reinstalling the new spark plugs, consider cleaning the area surrounding the threads. Change your plugs while you’re doing so since it’s a good time to inspect the wires for signs of wear and to clean up around the wire terminal. Clean up around the wire connections using a wire brush or compressed air, then check to be that you have a nice, clean port before proceeding. Repair or replace any damaged wiring. 3Insert the new plugs and tighten them down with your ratchet. Make sure you remove all of the spark plugs from the engine and replace them with new ones, using the spark-plug socket. Tighten merely a fraction of a turn (say, 1/8th of a turn) past hand-tight. It’s important not to overtighten the plugs since doing so can easily strip the thread on the engine’s head, resulting in a costly and time-consuming repair. Recall to replace the spark-plug cables on the identical plugs from where they were originally obtained as well as to remove the masking tape once the job is completed. For those who prefer not to use a ratchet with a torque setting, you can discover the torque specifications for the plugs in your vehicle’s service handbook (not the owner’s manual) and use a torque wrench. Before fitting the plugs, make sure they are well lubricated. For aluminum engines, you might want to use a very little quantity of anti-seize lubricant on the plug threads to prevent them from becoming stuck. The anti-seize avoids a reaction between metals that are different in composition. A tiny quantity of dielectric silicone compound applied to the inside of the spark plug wire boot can also make it easier to remove the plugs in the future, if necessary. Always spin the plug backwards on the thread until you have identified the hole correctly in order to avoid cross-threading your new plug and causing damage to the head and plugs. Always use a new plug to replace an old one. Make certain that the spark plug wire boot is properly secured to the spark plug. It may be necessary to apply more force to it in order for it to “snap” into place. Putting it on incorrectly might cause the engine to misfire, which can be quite dangerous (which will make the ride feel very shaky and rough). Advertisement
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- Question What are the signs and symptoms of a faulty spark plug? Funk Brothers Auto, a family-owned firm that has been in operation since 1925, is managed by Hovig Manouchekian, an auto repair and design specialist who also happens to be the manager. Hovig has more than 30 years of expertise in the automobile sector and is a specialist in the process of vehicle repair and upkeep. He is also well-versed in a variety of typical automobile concerns and requirements, such as engine repair, battery replacement, and the installation and maintenance of windshield accessories. Funk Brothers Auto has received the Angie’s List Super Service Award for five straight years as a result of Hovig’s expertise and dedication. Answer from an Auto RepairDesign SpecialistExpert When an engine fails to start, the most typical cause is a lack of spark. The spark plug is the device that is responsible for delivering the necessary spark to the engine. Typically, an engine will misfire owing to a lack of maintenance or the age of the spark plug
- However, this is not always the case. Question What is the best way to clean spark plugs? Funk Brothers Auto, a family-owned firm that has been in operation since 1925, is managed by Hovig Manouchekian, an auto repair and design specialist who also happens to be the manager. Hovig has more than 30 years of expertise in the automobile sector and is a specialist in the process of vehicle repair and upkeep. He is also well-versed in a variety of typical automobile concerns and requirements, such as engine repair, battery replacement, and the installation and maintenance of windshield accessories. Funk Brothers Auto has received the Angie’s List Super Service Award for five straight years as a result of Hovig’s expertise and dedication. Answer from an Auto RepairDesign SpecialistExpert Spark plugs may be cleaned with the help of a special tool. Sandblasting is used to clean the electrode of the spark plugs or the tip of the spark plugs, which is essentially what it does. Consider it to be a sand bag with sand inside of it. It is necessary to connect this tool to an air hose and enter the spark plug into that tool in order to successfully sandblast and clean it.
Question In what ways do faulty spark plugs manifest themselves? Funk Brothers Auto, a family-owned firm that has been in operation since 1925, is managed by Hovig Manouchekian, who is an auto repair and design specialist. Hovig has over 30 years of expertise in the automobile sector and is a specialist in the process of vehicle repair and upkeep. He is also well-versed in a variety of typical automobile concerns and requirements, such as engine repair, battery replacement, and the installation and maintenance of windshield accessories and glass.
- Answer from an Auto RepairDesign Specialist The absence of spark is the most prevalent cause of engine misfiring.
- An engine’s misfiring is usually caused by a lack of maintenance or by the age of the spark plug; however, this is not always the case.
- Funk Brothers Auto, a family-owned firm that has been in operation since 1925, is managed by Hovig Manouchekian, who is an auto repair and design specialist.
- He is also well-versed in a variety of typical automobile concerns and requirements, such as engine repair, battery replacement, and the installation and maintenance of windshield accessories and glass.
- Answer from an Auto RepairDesign Specialist Cleaning spark plugs may be accomplished with the use of an instrument.
Consider it to be a sand bag with sand inside of it for comparison. It is necessary to connect this tool to an air hose and enter the spark plug into it in order to successfully sandblast and clean it.
- Newer automobiles appear to have plugs that are tougher to reach, so search for all of the plugs to figure out where to start. Take into consideration removing concealed plugs first before replacing more easily accessible ones. Use a torque wrench to tighten the plugs to the specifications specified by your vehicle to ensure that they are neither over- or under-tightened. It is possible to obtain this information through shop manuals or by contacting the service department of your local dealership. When removing or inserting spark plugs, use a spark plug socket (with an interior gasket or magnet) rather than a regular socket to ensure that the plugs do not fall out of the socket. (If the gap is lowered, it often changes and must be re-gapped/cleaned or replaced!)
- Unlike gasoline engines, diesel engines do not have spark plugs. When replacing spark plugs, take care to ensure that nothing slips into the hole into which the spark plug is inserted. Before you remove an old plug, use compressed air to clear away any dirt or debris that has accumulated. If dirt has gotten into the engine, consider starting the car without the plug and allowing the piston to force air/dirt out in loud bursts (keep away from the engine while doing so to avoid potential eye injury and keep the children away)
- If the car has gotten into the engine, consider starting the car with the plug removed. Fortunately, it is unlikely that you will have to alter spacing right out of the box, but it pays to double-check. By doing so, you can prevent having to double-check the same plug twice because of a simple error. Only twist and pull on the boot insulator section of the wire cable, not on the wire cable itself, to avoid the wire cable from separating and necessitating the purchase of a whole new set of ignition wires. There are optional tools designed specifically for this phase
- Whether you maintain your own car or not, you should invest in a set of dealer’s shop manuals from the automobile manufacturer, or purchase them at a vehicle swap meet, on eBay, or at a market. You will discover that these are considerably more in-depth than the repair guidelines you would get at your local auto parts store, and they are well worth the money. If the engine has been running for an extended period of time without a single plug firing, gasoline will accumulate in the engine and flood the plug. It is possible for an engine to run for nearly a full minute in order to burn the fuel that has accumulated beneath the plug and then operate smoothly again. Just keep in mind that “a lot of fuel consumes a lot of air” (more than a few cycles of air is required)
- Check the model numbers of the spark plugs three times. In contrast to their obvious names, plugs are frequently numbered with drab numerals, such as 4546, or with the same forgettable digits simply swapped: for example, “5245” or “HY-2425,” among other things. Make a list of the numbers and/or letters you want to use. Before making a purchase, double-check the following: A simple error may result in a waste of time and effort, and you may be unable to obtain a refund as a result. It is possible to remove the spark plug without a spark plug socket by using a regular socket to loosen the plug and then using the boot to hold onto it and pull the plug out. The replacement plugs should be installed in the boot and turned on by hand before being tightened with the socket
- Keep youngsters away from the work area and ensure that they are wearing eye protection at all times. Allow plenty of time for the engine to cool down before changing the spark plugs in your vehicle. Their temperatures can reach dangerous levels, and the engine compartment may create a burn.
Things You’ll Need
- A new set of replacement spark plugs
- A socket or spark plug socket that is the same size as your old one
- A wire gauge and a spark plug gap tool (which may or may not be required)
- Thread chemical with anti-seize properties
- Silicone compound with dielectric properties
- Wearing personal protective equipment, such as goggles or eyeglasses, overalls, and gloves, if preferred. A socket swivel is also included to make it easier to access tricky sockets.
About This Article
Summary of the ArticleX Allow the engine to cool down to the point where it is cool to the touch before changing the spark plugs in your vehicle. Afterwards, look under the hood of your automobile for the spark plugs, which will be located at the engine end of a bundle of 4-8 wires. Remove the wire plug from one of the spark plugs with care, and then remove the spark plug using a socket wrench and an extension bar from the other spark plug. Once the initial spark plug has been removed, replace it with a new spark plug, making certain that it is the same plug or that it is the same as the plug stated in the owner’s handbook.
Continue reading to find out how to determine whether or not you need to replace your spark plugs.
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An automobile engine may appear to some people to be an impossibly intricate lump of mysterious equipment. However, even the most high-tech automobiles have certain components that are easily maintainable, despite the fact that this is not far from the reality for many current engines. Spark plugs, in particular, are among the most straightforward components to replace in any given engine. Nothing more than carefully following a few simple procedures and a couple of basic tools will suffice. It is possible that you have questions like how often you should change your spark plugs, what type of spark plugs you should use, or whether you should update your spark-plug wires before we go through the process step-by-step with you (if your engine has them).
- It is also important to remember that depending on your driving style, you may need to replace your spark plug wires every time you change your spark plugs.
- So let’s get this party started.
- Beginner’s level of ability New DIYers will benefit from completing this project.
- Estimated Time to Completion Depending on the engine, it might take 30 minutes to 3 hours.
- Use a blanket or towel to cover the fenders of your automobile (optional)
- You may want to throw an old blanket or towel over the fenders of your car so that you don’t scratch the paint when you lean into the engine compartment after gathering all of the equipment you’ll need, as well as the right spark plugs for your car and spark plug wires (if necessary). When working on anything electrical, it’s a good idea to disconnect the negative connection of your automobile battery as well. Suggestions for Improvement Before changing your spark plugs, make sure that your car’s engine has had the time to cool down. As a result, removing the plugs and the spark plug wire or ignition coil boot will be a lot less difficult. Clean the area surrounding your spark plugs to the best of your ability. You’ll have an open hole right into the inside of your engine once the spark plug is removed, and any dirt or debris around the spark plug can fall straight in and cause major wear or damage to your engine. This should be avoided at all costs, for obvious reasons. You may use compressed air to blast the area clean, as well as a cleaner/degreaser spray and shop towels to loosen and remove any muck that has accumulated around the ignition coil. Whenever you’re working with compressed air or a spray cleaner, make sure to wear eye protection. Once you’ve cleaned off the oil, dirt, and other debris from the region surrounding each spark plug, it’s time to begin the actual replacement operation with the new spark plugs. To avoid internal engine damage after extracting spark plugs, clear away any debris, such as leaves, before starting the job. If you have spark plug wires, remove a single spark plug wire from a single spark plug at a time to maintain everything in its proper sequence. When it’s time to reassemble everything, you won’t have to worry about accidentally attaching the wrong cable to the wrong plug. Coils on plug (COP) systems do not need the use of spark plug wires, thus it is sufficient to detach the coils and store them in a safe, out-of-the way position. Ignition coils are frequently fastened to the cylinder head cover with a single bolt, which is typically 10 mm in diameter. Magnetic trays are an excellent method to keep track of these bolts, which have a propensity to get sucked into the engine compartment’s black holes. Attach the appropriate combination of extensions and swivels to the spark-plug socket in order to comfortably fit the tool to the spark plug. (Optional) Turn the spark plug counterclockwise until it comes loose. (See illustration.) Despite the fact that you completely cleaned the area surrounding the spark plug before commencing, take care not to knock any previously unnoticed dirt into the now-open hole in the interior of your engine’s combustion chamber. It may take some trial and error to determine the most effective combination of sockets, extensions, and ratchet types to reach each spark plug. Suggestions for Improvement With time, the tabs on the ignition coil connector become brittle and weak. Using a pick to carefully press up on the tab while pulling the connection off of the coil can help you avoid breaking them off completely. Despite the fact that modern spark plugs are correctly gapped when they leave the factory, shipping and handling can cause this small, but critical gap to be altered. Before inserting a spark plug, it is a good idea to check the gap with a spark plug gap tool to verify it is proper. After verifying that the gap is proper (as described in your owner’s handbook), carefully insert the plug into the open hole by hand. If any adjustments are required, gently open or close the gap until the tool just fits at the correct gap (which should be mentioned in your owner’s manual). Even if the spark plug hasn’t been treated with anti-seize from the factory, you may use a little drop of anti-seize lubrication to rub on the spark plug thread to prevent it from locking up due to the heat. Beginning with a gentle clockwise rotation, begin screwing the plug into the socket, making that the threads are securely mated. Tighten each plug to the specified torque with hand tools. For 14 mm threads, if you do not have access to the manufacturer’s specifications, torque specifications are typically between 7 and 15 lb. ft. for threads with a diameter of 14 mm. Another option is to adhere to a general rule of thumb that states that after hand tightening, no more than a quarter turn should be applied. Suggestions for Improvement Power tools should not be used to thread in the new plugs. You run the danger of overtightening them, and the vibrations from the instrument might create hairline cracks in the porcelain of the plug’s delicate exterior. Although you may not be able to see the fractures, they will nonetheless have an impact on your performance. Reattach the spark plug wire or reinstall the ignition coil once the spark plug has been properly reinstalled. Using a little twisting motion, press the boot back down onto the exposed tip of plug until you hear and feel a hard click. That indicates that the plug wire has been correctly placed. Put a drop of dielectric grease inside the plug boot to aid in heat dissipation. Repeat the process in Steps 2 through 7 for each of your remaining spark plugs until you’ve completed the replacement process for all of them. If you’re also changing your spark plug wires, go back and replace them one at a time, following the same procedure as before. If you look closely, you’ll note that the length of the spark plug wires varies depending on where they’re supposed to go in the engine. Before removing the old wire and replacing it with the new one, make sure that each wire matches up to the existing wire. Continue until all of the cables have been replaced. You’ve completed your task! Be sure to record the current mileage of the vehicle in your maintenance notebook before you celebrate, so you’ll know when it’s time to replace the spark plugs again.
You may want to throw an old blanket or towel over the fenders of your car so that you don’t scratch the paint when you lean into the engine compartment after gathering all of the equipment you’ll need, as well as the appropriate spark plugs for your car and spark plug wires (if necessary). Whenever you’re working on something electrical, it’s a good idea to disconnect the negative terminal of your automobile battery. Suggestions for Success Replace your spark plugs only after your car’s engine has been allowed to cool completely.
Remove your spark plugs and thoroughly clean the space surrounding them.
If there is any muck or grime around the spark plug, use compressed air to blast it clean.
If you’re utilizing compressed air or a spray cleaner, make sure to wear eye protection.
To avoid internal engine damage after withdrawing spark plugs, clear away any debris, such as leaves, before starting the job.
When it’s time to reassemble everything, you won’t have to worry about connecting the wrong cable to the wrong plug.
When it comes to ignition coils, one bolt, usually 10 mm in diameter, is commonly used to fasten them to the cylinder head cover.
To comfortably fit the tool to the spark plug, attach the necessary combination of extensions and swivels to the spark-plug socket.
(See illustration) Remember to take care not to knock any previously undetected dirt into the now-open hole in the engine’s interior, even if you cleaned the area surrounding the spark plug properly before commencing the process.
Suggestions for Success After a while, the tabs on the ignition coil connector become brittle and flimsy.
Despite the fact that modern spark plugs are correctly gapped when they leave the manufacturer, shipping and handling might cause this small, but critical gap to be adjusted.
After verifying that the gap is proper (as described in your owner’s handbook), carefully insert the plug into the open hole by hand.
The spark plug thread can become seized if it is not treated with anti-seize at the factory.
Beginning with a gentle clockwise rotation, begin screwing the plug into place, making that the threads are securely bonded.
The torque specifications for 14 mm threads range between 7 and 15 lb.ft.
Another option is to adhere to a basic rule of thumb that states that after hand tightening, no more than a quarter rotation should be given.
You run the danger of overtightening them, and the vibrations from the instrument might create hairline cracks in the porcelain of the plug’s delicate body.
Reattach the plug wire or reinstall the ignition coil once the spark plug has been properly reinstalled.
If you see this, it implies the plug wire has been correctly positioned.
Repeat the process in Steps 2 through 7 for each of your remaining spark plugs until you’ve replaced them.
If you look closely, you’ll note that the length of the spark plug wires varies depending on where they’re supposed to go in the engine.
Continually replace the wires until all of them have been replaced You have completed your task! Be sure to record the car’s current mileage in your maintenance notebook before you celebrate, so you’ll know when it’s time to replace the spark plugs again.