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Spark Plugs

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Symptoms of Bad or Failing Spark Plugs
Common signs include slow acceleration, 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...
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
Bad gas
You may have got some gas that has some water in it since problem started real soon after refueling. The issue would be is would bad fuel cause only one cylinder to misfire? It is not likely that it would....
Question
Spark plug replacement
The socket size is 5/8 for the spark plug replacement. The spark plug wires should be inspected for dry cracks in the outer cover and also look for small white or black spots on the exterior of the wire indicating...
Question
Car turns over, but will not start. The accelerator pedal produces NO change in engine performance.
Hi there. Check the ignition system and see if the spark plugs have any spark. If the spark plugs have no spark, then check for power to the coil. If the there is no power to the coil, then check...
Question
Have oil on one of my spark plug wires in the spark plug well the test are fine. What should I do.
Hi there. The issue that you are having is a small o-ring seal on your valve cover is either split or damaged. The valve cover should have a seal all the way around it and 4 o-rings in the middle...
Question
Trying to locate the number 1 cylinder on a 1994 mazda protege 1.8 dohc
The number one cylinder on this engine is the cylinder that is closest to the passenger side or farthest away from the transmission side of the engine.
Question
P0306 code misfire
Hello there, many common faults will cause a cylinder 6 misfire in your 2001 Chevrolet Impala. The most common faults are the spark plugs, plug wires, fuel injectors, vacuum leak, fuel pump, or low cylinder compression. A qualified Technician such...
Question
Spark plugs
Installing a spark plug incorrect is most likely caused by the gap of the plug is incorrect or hit when installing it closing the gap. The spark plug may also get cracked when installing the plug. After any of these...
Question
cylinder 3 and 4 misfire
Hi there. Check the spark plugs to see if they have burn spots on them. Switch them out with cylinders that are firing. If the other cylinders do not fire now, then the spark plugs need replaced. If the same...
Question
My check engine light came on so I brought it to Autozone. They told my #5 ignition coil was misfiring, can I still drive it?
The vehicle should be able to be driven for a short period of time without causing further damage since problem is intermittent. You should have a mechanic like one from YourMechanic diagnose the code for the misfire. The code P0305...
Question
Oil is leaking into spark plug wells
Hello. You are correct. There has likely been a gasket and, or grommet failure. The oil contaminates the plug and retards the spark. Hence the poor engine performance. It also causes the pressures to vary from normal and stresses out...
Question
Oil fouls one spark plug - possible cause and recommendations to repair.
Hi there. If oil is causing the spark plug on cylinder number 4 to foul out every 600 to 700 miles, then the valve guide seals to that cylinder are damaged and need replaced. The valve guide seals prevent excessive...
Question
Oil in spark plug chamber
Hello. Thanks for writing in. Oil in the spark plug wells is typically due to a failed gasket or o-ring. It can be a sign of more serious engine damage related to a failing valve or worn piston ring. You...
Question
engine cranks over but won't start
Hello. Thank you for writing in. The fuel smell you are having is from the engine throwing fuel into the cylinders that is not being burned. The spark system will is likely the cause of your no start. If none...
Question
Spark plug wires get heated and check light comes on
If your ignition spark plug cables are burning through then it is caused by not being in contact with the spark plugs and the spark plugs have high resistance. Replace the spark plugs and spark plug wires.
Question
Vehicle check engine light is on - cannot pass smog test and stalls out - even when u press on gas pedal.
Sent to CS for billing question on how much it would cost for a tune up for the BMW to pass emissions test. A tune up comes with cleaning out the fuel system and performing a fuel injection flush, replacing...
Question
Magnet stuck on spark plug.
I do not have a vehicle listed so I am not sure how to guide you. but depending on the location of the spark plug hole, he may be able to use needle nose pliers to go into the hole...
Question
I was driving on the highway and I lost power and the car cut off. The car will not start back up and it has gas in it has coming through the gas line.
Hi there. Check the ignition system and see if the spark plugs are sparking. If the spark plugs are not sparking, then check for power to the ignition coil. If there is no power to the ignition coil, then check...
Question
Code said cylinder 1 misfire, cylinder 2 misfire, o2 sensor misfire?
Without checking the ignition coils and spark plugs myself for proper spark output I would say the engine is misfiring and may be the coils and plugs. It is also common for the valve cover gasket to leak oil into...
Question
no start issue 1990 ford ranger custom v6 2.9l automatic RWD
If, by chance, the fuel has been in the fuel tank "for a while", it won't burn, at least not in an engine. So, the first thing to consider is the age of the gas. The plugs do have to...
Question
Computer went bad that controls spark plug
Before you can determine if the vehicle should be repaired you should have a qualified mechanic like one from YourMechanic come to you and scan the computer for you. You may have a sensor like the crankshaft sensor that could...

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