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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 stop sign, tires screeching as it lurches and bucks, with shotgun bangs coming from the...
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
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
How much labor costs is it to replace spark plugs and wires on a 2001 buick lesabre?
The cost depends on whether you have the V6 or V8 engine. The V8 requires significantly more time for the plugs and wires due to the amount of disassembly required to get to the wires, particularly on the right bank...
Question
Spark plug closest to firewall /on 4.0 grand cherokee has oil on it
If you are getting oil in the back cylinder then you either have excessive oil getting into cylinder from valve seals from low oil flow in the valve cover area from too thick of oil or lack of oil changes....
Question
My sl600 V12 has 161,000 miles. Do I need to replace the ignition wires?
If you suspect that the engine is misfiring, you should identify and resolve the cause now because misfiring can cause lots of collateral damage such as plugging up the catalytic converter. Misfiring also wastes lots of gas, has the potential...
Question
Spark plugs are decentagrating
Premature failure of spark plugs can be caused be pre-ignition, overheating, and plug contamination from oil in the case of a worn out engine. Some of these faults can be readily resolved and so it is best to have the...
Question
2012 Jeep Wrangler hesitates at starting up.
The issue could be the throttle position sensor on the throttle body giving a false reading and causing the engine to hesitate when starting. For the hesitation when driving, that also could be the throttle position sensor, but more like...
Question
The spark plug on my 2005 Nissan Altima on the first one has oil on it. How do I fix it. I need help how too fix it also.
If you are referring for the oil to be on the igniter portion of the spark plug inside the engine, then the oil control ring on the piston could be leaking, the head gasket could be burned and leaking oil...
Question
I have an 03 Kia Reo. Spark plugs have never been re-placed. Car is sputtering when I start to excellerate and has issues going up
The spark plugs and engine air filter on the 2003 Kia Rio should be replaced every 30,000 miles. The fuel filter and the timing belt should be replaced every 60,000 miles. It would be best to perform all of this...
Question
Car misfires then goes to limp mode.
When the vehicle goes into limp mode when the engine misfires, the computer is shutting down the electronics to the transmission to prevent damage to the catalytic converter as the fuel condition is either too lean or too rich. Check...
Question
Only found 3 spark plugs on top of engine
You may have to just measure the distance from one spark plug hole to the next and find the lost hole. There are all about 3 inches away from each other and accesed from the top of the engine. ...
Question
Crossed spark plug wires? 1997 Jeep Cherokee
Hello - "crossed spark plug wires" means simply that your plug wires are not attached to the plugs and/or the distributor in the correct firing order. Your cylinders are numbered 1 to 6, front to rear on your engine. The...
Question
I have a 2007 dodge charger v6 3.5L engine NAG1 RWD Transmission. I'm confused in what is causing limp mode in my car..when the c
The code P0420 will cause the computer to put the transmission in limp mode to protect the catalytic converter. Check the following areas to see the cause for the P0420 code condition: P0420 A damaged or failed oxygen sensor...
Question
Crank no start
Hi there. The issue seems to have a misfire with the spark plugs and wires. The smoke that is coming out of the breather on the intake or valve covers is caused by the fuel burning on the exhaust stroke....
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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