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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
loosing power power between 3 & 4 spark plug
Hello, thank you for writing in. The vehicle should have some basic testing done before it is assumed anything major is wrong. Make sure the distributor is clean, dry, tight, and in perfect condition. If appears to be flawless, turn...
Question
Has 135000 miles on original spark plugs. Car runs smooth and averages 23 mpg. It's hard for me to fix it if it ain't broke.
Spark plugs are replaced on a manufacturer specified maintenance schedule, in part due to plug gap erosion. Regular replacement at the 90,000 mile service interval interval that is specified for you model year also prevents a circumstance where the plug...
Question
Spark plug replacement on 2011 BMW 328xi
Your vehicle was equipped with 100,000 mile spark plugs. The first recommended change is at 100,000 miles. If a Diagnostic Trouble Code has led you to test the ignition system and you find that an individual plug over coil tests...
Question
Crank no start. Not switching signals at the ignition coil.
Hi there. When your friend removed the spark plug while the engine was running and it was not grounded, the lazy spark may have shorted out the module in the distributor or it could have shorted out the coil in...
Question
Misfire in cylinder number 8.
Hi there. The issue could be the spark plug not firing on cylinder 8, the fuel injector not atomizing on cylinder 8, or there could be a burned valve or a burned head gasket. Check the spark plug on cylinder...
Question
Sputtering and popping with a loss of power. Most recently died and after driving cat converter was cherry red hot.
Hi there. There could be an issue with the spark plugs not firing causing excessive amounts of hydro carbons (raw fuel) to go into the exhaust system. When excessive fuel goes into the exhaust system, the catalytic converter will glow...
Question
m y mechanic put a 5.4 3valve reman into my 2007 lincoln navigator.
Hi there. Check the cylinders that are misfiring for fouled out spark plugs or non working injectors. Look at the spark plugs and see if there is any burn marks or corrosion. If there is no signs of wear on...
Question
Spark plugs
Autolite Part Number AP103 {#AP103DP2} are OE style platinum plugs that fit your vehicle. They are pre-gapped to .054 in. These are the most economical option and thus are recommended. There are other brands and other options but they are...
Question
Yourmechanic does not service my area (Erin,TN 37061). Can you give me an estimate?
The cost will depend on several factors, one of which is whether you have the double overhead cam (DOHC) version of the 5.4L engine, that is 4 valves per cylinder. If you have the "regular" 5.4L engine, it takes 3.1...
Question
Cost to fix: Spark plug #4 on passenger side blew out of its cylinder. Common on 5.4 Tritons. only need this spark plug 2000 Ford F150
Hi there. Unfortunately, this is a service that requires advanced machining tools; which our mobile mechanics don't typically have access to on site. As such, it's not a service we provide at YourMechanic.com. You might be better served contacting a...
Question
How much does it cost to replace spark plugs on a V6 engine?
Billing question sent to CS for the cost to replace spark plugs on a V6 engine.
Question
What is the mechanics book time to replace V6 2013 Dodge Journey spark plugs
Hi...it requires 1.4 hours to remove and replace all spark plugs on the 3.6L. If you desire that the spark plugs be replaced by a certified Mechanic, dispatched by YourMechanic right to your location, please request spark plug replacement and...
Question
Why would a solenoid replacement , and spark plugs cost 943.
Hi Jacqueline: Spark plugs for your vehicle, if you buy them retail, over the counter, from any of the auto parts stores cost roughly $2 to $4 per plug, plus tax. Your vehicle has 4 cylinders so, of course, you...
Question
Engine misfiring p0300 code
Hello there, many faults will cause a random misfire in your 2004 Chevrolet Classic. Replacing the spark plugs is the first step so it's great you have taken care of that already. A few other faults will cause cause a...
Question
Bank 1 air fuel imbalance alarm car is misfire after it gets hot ok up till that time
Hi there. Check the spark plugs and see if the plugs have a good bold spark. If the plugs are not sparking, then either the plugs are fouled out or the ignition coils are not energizing. Check the fuel injectors...
Question
Cranks but does not start.
Hi there. Check the spark plugs and see if they are burned. If the spark plugs are old and have not been replaced for a long time, then they could be fouled out. I recommend replacing the spark plugs with...
Question
Misfiring Cylinder after replacing the plugs three months ago. Is it a chance that the whole batch of plugs may have been defective?
Hi there. The best thing to do is switch the coil over from cylinder 3 to cylinder 1 and see if the misfire continues with cylinder 3 or if it changes to cylinder 1. If the misfire stays with cylinder...
Question
I need to know the complete price it will be on my 2008 Chevy cobalt ls
Billing question sent to CS for the cost to diagnose a check engine light and the cost to replace spark plugs on a 2008 Chevrolet Cobalt.
Question
Multiple cylinder misfire detected. Changed the distributor, fuel pressure regulator, injectors and the coil.
Hi there. Check the spark plugs in the engine and see if they have a bold spark. If the spark plugs and wires are old, they can cause the electrical current to flow slower than normal to the cylinder causing...
Question
Blinking engine light
The engine shaking and idling rough with a flashing check engine light is an indication you have a misfire in the engine. If you have a computer scan it should show ignition misfire codes to one or more cylinders misfiring....

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