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Spark Plugs

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Symptoms of Bad or Failing Spark Plugs
Common signs of faulty spark plugs include slow acceleration, loss of power, poor fuel economy, engine misfires, and difficulty starting the car.
How to Change Your Spark Plugs
Tune-ups have changed a lot over the years. Your grandpa’s car had a distributor with points that required periodic replacement. Thankfully, computers have taken control in modern cars, eliminating the...
What Does It Mean When an Engine "Knocks"?
If your engine is making a knocking noise it means there's a problem. The wrong fuel octane, carbon buildup, and bad spark plugs can cause knocking.
How Long Does an Ignition Cable (Spark plug wires) Last?
The ignition of a car is an essential part of a good running engine. Each time that you turn the key of your car over to crank it, the ignition wires will...
How to Find Top Dead Center
There are many reasons why you might need to find an engine’s top dead center. Top dead center is the point when the piston of the number one cylinder in an...
How Long Do Spark Plugs Last?
In order to operate, your engine needs fuel and air. However, those two things alone won’t make it run. It needs a way to ignite the fuel after mixing it with air...
How to Buy Good Quality Spark Plugs
Sparks make everything happen! Without spark plugs, your vehicle would never be able to kick off combustion, providing the necessary power to make your car go forward. If your engine is starting...
What Causes a Car to Backfire?
You’ve got an image of it in your head right now. An old car drives off jerkily from a...
How to Gap a Spark Plug
The spark plug is used to ignite the air/fuel mixture inside the engine. The spark plug must be in good condition and must be properly gapped for proper engine...
How to Check Spark Plug Wires
Car engines that have a distributor or remote coil pack have spark plug wires that transfer the spark from the coil to the spark plug.
How to Read Your Spark Plugs
Car spark plugs create the spark necessary in the combustion cycle. Check your spark plugs to improve your engine efficiency and performance.
What Does a Spark Plug Do?
Your ignition system is pretty complex, and there are a number of important components that must work with one another to crank the engine and then keep it running. Your spark plugs are...
What Does Ignition Timing Mean?
Timing – it has a couple of different meanings when applied to your car’s engine. One of the most critical is ignition timing (not to be confused with engine timing). Ignition timing refers...
How to Buy a Good Quality Ignition Cable (Spark Plug Wires)
Spark plug wires connect the spark plug to what they’re creating a spark in. Whenever you are changing out your spark plugs, it’s a good idea to check on those spark plug wires to...

Related questions

Question
I changed all 6 spark plugs on a 06 avalon yesterday and when i got it all put back together the engine shakes and shuts off
Hello, thank you for writing in. A simple spark plug change can turn into a nightmare for anyone if they are not careful. What typically happens is that you screw in and tighten the spark plugs too hard. When this...
Question
my car its the engine misfire and only works with 2 sparkles out of 4 do you know how much its going to cost the labor
Hello, thank you for writing in. The most common and simple reason for these issues are bad spark plug wires. You can easily test this by swapping the wires on both the spark plugs side and the ignition coil side....
Question
Hello Chris, Do you know how many Spark Plugs do I need to change on my 2008 BMW 750li?
This engine has eight cylinders with only one spark plug per cylinder. You have a total of eight spark plugs.
Question
I have a 2002 toyota camry and my car starts and turns off after about 10 mins after at first it would not crank so i got a new st
Hello, thank you for writing in. There are several reasons why the vehicle may be stalling. You should ALWAYS start by having the vehicle scanned for codes when there is an issue, regardless of a warning light being illuminated. When...
Question
Why am I getting quotes for spark plug replacement for a 2008 Toyota Avalon of 495?
Spark plugs on your model do require relatively more labor time to replace, compared to other vehicles. That is why the quote you are getting seems high for a part that is so simple. However, your general supposition that the...
Question
my mechanic said there is water in my sparkplugs car won't turn on just sounds like spinning 1999 galant
If there is a coolant leak into the cylinder(s), or externally down the spark plug tubes, such a leak would have to be resolved prior to running the engine, or attempting to diagnose a non-running engine. If you request a...
Question
Changed plugs now one cylinder is blowing air out of plug hole 2005 Chrysler 300
Hi there. If compression is getting through around the plug then there is a thread problem. I would typically remove the plug and inspect the threads with a scope. If they are damaged then a steal insert would be needed...
Question
I have hummer h3 that needs a raditor i have the raditor need to know your labor fee and do have to buy antifreeze and.i have spar
To obtain the requested quote, please visit YourMechanic’s radiator replacement service page. Once on that page, click on "Get a Quote" and enter your vehicle information (year, make, model). You are welcome to buy your own parts and book a...
Question
If your crank shaft oxygen sensor is out what does your car do?
The oxygen sensor is mounted in the exhaust system piping. The sensor is easily tested. If the sensor is defective, gas mileage will be somewhat reduced and the engine will not perform well. Oil in and around the spark plugs...
Question
Changing spark plug or ignition coils
Changing spark plugs at 46000 isn't necessarily a bad idea, but mostly I say that because it will keep them from seizing to the cylinder head. Most late model cars like yours can run a set of plugs for longer...
Question
when should i replace spark plugs
The service life of spark plugs on this vehicle is 100,000 miles. If the plugs have never been replaced, exercise caution during removal as the plug threads can get quite stuck to the head, and possibly seized, if too much...
Question
Do you use iridiums spark plugs on the spark plug replacement
The OEM plug is platinum. If you desire iridium, simply note that in the customer notes or let the mechanic know at time of scheduling. Obviously, without contrary advice, the original, or aftermarket equivalent, of a part is always used...
Question
I have a 2001 Lincoln LS and the spark plug on the number 8 cylinder is leaking getting oil on the spark plug what do you think th
Sometimes there can be oil on the spark plug threads but the plug itself is not fouled. If the firing end of the plug is OK (not fouled, and not covered with liquid oil and so forth), the cause of...
Question
I have a 2006 Hyundai Azera Limited all the cylinder are misfire would this stop the car from starting up?
Hello, thank you for writing in. The vehicle is not starting because of the issue causing the misfire. If not cylinders are firing when they are being told to, there will be no combustion, and the car will not run....
Question
What is the main reason for a random misfire on Audi A6 2002 3.0
Hello, thank you for writing in. Without the codes that are present it is hard to narrow down the possibilities for you. Coil packs and fuel supply are going to be towards the top of the list. You should start...
Question
how many spark plugs does a cadiliac cts 2017 have?
This engine has one spark plug and coil per cylinder. This is a 4 cylinder engine. Has 4 spark plugs.
Question
My V70 sputters intermittently.
I have seen where the electrical connectors to the ignition coils fall apart and will intermittently lose connection and short out. Have the connectors checked to see if they are bad and need repaired or replaced. As far as the...
Question
Joshua how much will it cost to replace all coils and plugs
Hello, thank you for writing in. The technician's do not have the ability to create proper quotes due to the pricing of labor and parts being dependent on your location. With that being said, I can share some of the...
Question
I had O2 sensor replaced twice in 4 months, but the engine light came on again 2011 Audi A6.
Hi there. If the check engine light is still on for the oxygen sensors, look at the description of the code to see if the sensor relates to a lean or rich condition. If the code does not, then there...
Question
How to remove spark plugs in 2012 Volkswagen Jetta
Hi there - replacing your spark plugs is fairly straightforward. First the engine cover is removed - this is the large plastic cover over the top of the engine which provides noise insulation as well as being decorative. Pull up...

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