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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
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
No spark?
Spark related problems generally will result from things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition modules not working properly. When an ignition coil becomes faulty, there is generally a bit of warning as they...
Question
Stalling engine after engine warms up
This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts at a higher...
Question
Won't start after it runs for a few minutes until I let it set for hours.
Hello - if the Check Engine light is on, getting the problem codes is the first task. Check also battery and ground cable connections for corrosion or loose connectors. Determining whether you are missing spark or fuel during these "hot...
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
Trying to shut off
This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that open when heated and close...
Question
My car is not starting; what should I replace?
Your engine's computer gets crank signals from the crankshaft and camshaft sensors and then uses these signals to fire the coils. To see if the sensors are sending these signals to the computer, you can scan the computer using a...
Question
I believe one of my ignition coils is bad, how can I test to see which one is bad?
The only way to determine exactly which ignition coil is damaged is to have a professional mechanic complete a diagnostic scan and download all error codes. The OBD-II error codes will pinpoint the source of engine issues. Having a mechanic...
Question
Can I drive 500 miles with a bad ignition coil?
Unfortunately, a faulty ignition coil is known for randomly failing with or without warning. There are usually indications that it may be failing, however, it is often times difficult to know just how long it may last once it begins...
Question
So I need a total tune up on my car! I was wondering if I could replace my spark plugs now and wait till next week to replace the coils?
Hi, thanks for writing in. Yes, that will not be a problem at all. If the coil is tested and is within spec there is no reason to replace it at all - I recommend using it. A fouled spark...
Question
The Check Engine Light came on, I hooked it up to my scanner and got the code P0308
Hello. A cylinder misfire can be caused by many things. If you are not able to notice any issues with engine performance then the misfire is likely minor or intermittent. A few common causes for a misfire are a faulty...
Question
Oil leaking into spark plugs galley, car won't start
If you found oil has entered the spark plug tube galley then the oil may have shorted out all the coils and plug wires causing the engine no start. The oil is getting in the galley from a leaking valve...
Question
Check Engine Light is on - P0302 and P0304. Ignition coil recently replaced.
The two Diagnostic Trouble Codes, P0304 and P0302, refer to cylinder misfiring. A faulty ignition coil, spark plug, wire, and so forth can cause a cylinder to misfire but there are other possible causes, too. Consequently, the only way to...
Question
Engine lite just started flashing on and off and the car is shaking while in the stopped position
The flashing check engine light is letting you know that there is a problem that is urgent or the catalyst may be damaged. You most likely have a failed ignition coil or failed spark plug. In order to find out...
Question
Blinking Check Engine Light
As you may know, the Check Engine Light can come on for many different reasons, including for the ignition coils being faulty. Many times, when there are no visible signs or obvious symptoms of the car running poorly, it requires...
Question
Truck won't start after it gets hot. What can cause this?
This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts at a higher...
Question
Starts and idles fine but then stalls. What causes this?
This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts at a higher...
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
Warm starting Problems
This sounds like a common sign of a failing ignition coil. Components that contain heat sensitive materials include parts like coils, injectors, igniters, and some sensors. Every time you start the engine again the coolant flows, the fans turn on,...
Question
I had a bad oil leak and now I hear a spark sound. Do I need a new coil?
If the oil leak has made its way to any spark plug wires or coils and the wires or coils show signs of swelling or cracking then the component must be replaced especially if spark is coming out. The oil...

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