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Ignition Coils

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How Are High-Performance Ignition Systems Different from Standard Ones?
Once upon a time, there was only one type of ignition system. It used a distributor, points, a coil, and was subject to significant wear and tear. Then came the electronic ignition, which replaced...
How to Buy a Good Quality Ignition Coil
Ignition coils operate in a very similar fashion to a transformer; with a 12-volt power source that produces output current simultaneously to an input current that’s being applied. By creating an efficient magnetic field,...
How Long Does an Ignition Coil Last?
The combustion process that happens when your car is cranked is vital in order to get the car moving. In order for this process to take place, a number of different components...
How to Test a Spark Plug Ignition Coil
An ignition coil is a vital component of today’s modern engine management system. Virtually all vehicles manufactured today use ignition coils to provide the spark for the engine’s spark plugs. An ignition...
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 Replace an Ignition Coil
Your spark plugs work with the ignition coil to receive signals from your vehicle’s computer. A bad coil can cause driveability issues like stalling.

Related questions

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
Can it be determined which coil in faulty so that only that one will be replace? My 2006 Volvo S60 has been occassionally shutting
When the computer is tested for the misfire the computer should identify what cylinder is misfiring. If the computer does not log a specific cylinder misfire code then it cannot be determined to replace a single coil. Have the computer...
Question
My car has trouble starting when the engine is hot, I never have a problem in the morning or when I get off work.
Hi there. It sounds like the ignition coils are getting hot and when the engine is shut off, the engine will not restart due to an ignition coil that will not produce a spark. Remove one spark plug wire at...
Question
increased engine over load message.
Hi there. The message is coming on for the catalytic converter overheating. A misfire or leaking injector will cause the catalytic converter to overheat as raw fuel enters the exhaust system. Check the engine for a misfire and see which...
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....
Question
Ignition electrical problem no constant battery powering truck.
Hi there. Check the power wire to the ignition coil on the engine. If there is no power to the coil, then there is a break in the wiring from the coil to the ignition switch. If there is power...
Question
Got a diagnostic, mech says car need theromostat and all coils and plugs. Car was fine then check engine light 2009 Mini Cooper
Hi - I would do a quick check on the problem codes causing the Check Engine light and other warnings you mention. In general you would have an occasional misfire or hiccup that you should feel as engine vibration as...
Question
Engine, brake, cruise, traction control lights all came on at the same time and the dealership stated it is a fault of the coils
Hello, thank you for writing in. Typically when you replace coils, although it may not be the most comfortable option cost wise, you want to replace all of them. While there is no rule against replacing one or two of...
Question
Engine light fault. There was a bad spark plug and a failed ignition coil. Replaced both the coil pack or spark plug.
Hi there. If the light is coming on then shutting off and returning on, then if the issue is for the same coil, there could be an issue with the wiring on the coil plug. Check the wiring on the...
Question
How much would a spark plug change be for a 4.6l 99 expedition? And should I change coils too?
Billing question was sent to CS for the cost to replace the spark plugs and the ignition coils on a 1999 Ford Expedition with a V8-4.6L engine.
Question
My 2009 Kia Rio needs new ignition/coils. There is a huge difference in internet pricing vs. buying locally. Any ideas why?
I cannot claim to know the quality of every coil on the online or local market. I can tell you that some of the online coils are subpar and will not last long and even have been known to short...
Question
On a 2000 dodge with 5.9 letter engine. I have no power from the coil to the distributor. What would be my next step in troubleshooting?
Hi there. Check the wiring to the coil and see if there is battery voltage going to the coil. If there is battery voltage, then the ignition coil needs replaced. If there is no voltage to the coil, then check...
Question
I'm getting power to distributor coil, but I'm not getting power to the spark plugs.
Hi there. Check the spark plugs with a spark adapter tool to see if there is a park induced from the coil. If there is no spark, then the spark plug wires could be burned and need replaced. If the...
Question
Would it cause damage to the other ignition coils if there is oil leaking from the valve cover gasket on my 2002 Infiniti I35
Hi there. If there is oil leaking into the ignition coil bores then that oil leak needs to be repaired first. If there is oil in multiple tubes then those ignition coils should be replaced also. If they are dry...
Question
Changed Coil pack 4 and 8 three times, do you think its my ECM on a 1998 Lincoln Navigator?
On both cylinder number 8 and 4 are the two coils that see the most heat related failures and should only be replaced with a quality coil. I have seen some of the less expensive coils on the market to...
Question
I been having problems with my car, a couple of days ago its would not start.... The dipstick was creamy, I checked my coils, 2004 Nissan Altima
Hello - to be sure, a leaking valve cover gasket that is allowing oil to leak onto the plugs, plug boots or coils, will cause misfire issues, and uncertain engine starting performance. I recommend a car is not starting inspection...
Question
Van stalls when it gets warm, i wait a little while 15min to 20min it starts up, until it gets to warm and stalls again.
Check the ignition coil on your engine. If the coil in new with the distributor, then the problem could be the computer or module of the vehicle. An ECM or PCM will cause the ignition system to shut down if...
Question
No spark?
Hello. To help find out why the vehicle is not getting spark you will be at the test the signal being sent to the coil pack as well as test crankshaft position sensor. The crankshaft position sensor should have been...
Question
Firing order from the front of the engine.
The location of the ignition coil for the 3rd cylinder is the 3rd cylinder back from the front of the engine where the belts are. From viewing the engine from the front of the vehicle, the 3rd cylinder will be...
Question
I got a diagnosis for a 2012 X6 saying the combustion misfires due to faulty ignition coil and I've gotten a recommendation to rep
Hello, and thank you for writing in. Getting a second opinion is always a good idea. Replacing the spark plugs is a very necessary part of maintenance that is often overlooked. It is never a bad idea to replace your...

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