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Spark Plugs

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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.
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 Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
How Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
How Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
How Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
What Causes Spark Plugs to Wear Out?
Without operational spark plugs, your engine won’t run. If even just one plug were to fail, the change in functionality would...
What Causes Spark Plugs to Wear Out?
Without operational spark plugs, your engine won’t run. If even just one plug were to fail, the change in functionality would...
What Causes Spark Plugs to Wear Out?
Without operational spark plugs, your engine won’t run. If even just one plug were to fail, the change in functionality would...
What Causes Spark Plugs to Wear Out?
Without operational spark plugs, your engine won’t run. If even just one plug were to fail, the change in functionality would...
What Causes Spark Plugs to Wear Out?
Without operational spark plugs, your engine won’t run. If even just one plug were to fail, the change in functionality would...
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...
How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
How Often Should Spark Plugs Be Replaced?
While your engine runs on gasoline, it also requires electricity. It’s needed to operate most of your accessories, but is also required to...
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.
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 Change Your Spark Plugs
Tune-ups 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 need for a lot of these archaic parts. One...

Related questions

Question
I changed spark plugs and wires & cleaned throttle body, car idles rough and gas mileage is changed does not backfire or anything
A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...
Question
Won't stay running
Hello and thank you for your question. It seems to be the transmission that is causing the engine to stall out when you are putting the vehicle into drive. The transmission could have a converter clutch lock up issue causing...
Question
Will crank but won't start
You need to check to see if you have spark to the plugs. Scan the computer to see if crankshaft and camshaft sensors are signaling the computer to spark. If not then replace the defective spark plug. If it's proven...
Question
Why do I smell gas in the car?
There could be several reason why your car is smelling like gas. Your car's spark plugs could be very worn out and not firing properly, causing the gas not to be burned properly and creating a gas smell in the...
Question
What is causing the engine misfires?
It is usually best to change all the coils when chasing a misfire with engines of this age and mileage. If one is weak, they are likely all weak. When you changed the plugs, was there oil in the spark...
Question
Spark plugs popping out
Hello. You would be correct that the threads are stripped. The stripped spark plug holes could be repaired by having a technician helicoil them. This would only be a temporary fix and doesn't always hold up. Ultimately, you would need...
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
spark plugs
Hello there, the spark plugs on your 2008 Acura RDX are replaced in regular service intervals. The service interval for your vehicle states the spark plugs should be replaced every 60,000 miles. The RDX is equipped with a maintenance minder...
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
Spark plug popping out
Hello. This is a common problem on the Ford modular V8. The new spark plug won't stay because the threads are stripped out. There are two repairs: 1) drilling, and installing a threaded insert into the head for the spark...
Question
Spark plug popped-out
It is common on this engine for the spark plugs to pop, and there are two typical fixes: either the spark plug hole could have a new insert put into it, or the head will have to be replaced. I...
Question
Spark plug covered in oil
A fouled spark plug is a common issue with modern vehicles. Thinner oils are used to reduce friction and increase fuel economy. These thin oils in combination with a vehicle with higher mileage will cause oil to seep past the...
Question
Spark plug blew out
Spark plugs blowing out are not uncommon for that specific year and engine of the vehicle. When a spark plug blows out, usually the threads need to be repaired, or replaced, and a new spark plug installed. This job may...
Question
Spark plug
It's never a good idea to drive a car with a misfiring engine! If the misfire is due to a bad spark plug as you are presuming, there could be secondary ignition voltage feeding back to the ignition system which...
Question
Overheating
When you put pressure in the radiator you are only going up to about 15 psi, but when a cylinder fires, it puts out a lot more than the compression test showed at 125 psi. This is why you are...
Question
Oil on spark plug
There can only be two ways the oil is getting on the spark plug. The piston oil control rings are stuck or broken and letting excess oil into the cylinder. The intake valves seals for the cylinder...
Question
Oil is leaking onto the spark plugs
Oil on the spark plugs can come from a failed seal, or it can come from a failed valve cover gasket. The spark plug well seals you are referring to can be changed. It is a slightly lengthy process to...
Question
No spark from spark plugs
If you are not getting a spark from the wires, then there may be a problem with the ignition system, or engine management system. As both systems are electrical, and sometimes highly elaborate in nature, I would recommend having a...
Question
No spark at spark plugs
I will assume that the results of the test were taken from the location between the spark plug boot, and the top of the spark plug. In this case, the spark is not getting to the wire at all, or...
Question
My car won't stay on
Hi there. Assuming the backfiring was taking place prior to replacing the spark plugs and spark plug wires. This would lead me to believe there is a valve train related issue. Possibly, a broken intake valve spring. This would account...

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