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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
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...
Question
How to tell the ignition coil is bad or good? Lexus
Hi there - basic testing of ignition coils can be done with a volt meter, checking for shorts or a specified level of resistance (measured in ohms) in the coil windings. Failing coils require an oscilloscope (or similar testing tool)...
Question
Possible causes of P0303 code 2009 Dodge Journey
Hi there - misfires can be caused by worn spark plugs, failing coils, or injectors dumping too much (or no) fuel into a cylinder, causing a misfire. Yes, this could be a failing coil. Swap the cylinder #3 coil with...
Question
My car starts in the morning with a sputter.
The noise could be either an ignition coil misfiring and causing the engine to stall on a cylinder making the engine sputter or the engine is sputtering with an injector that is sticking until it get hot as it maybe...
Question
93 ford explorer is bucking.
Hi there. Check the spark plugs, spark plug wires, and the ignition coils and see if they are working. Check for spark on all of the cylinders and see if the spark is good. If the spark is good, then...
Question
I installed the engine but has no fire to injectors or coil pack. Changed the crank sensor and cam sensor. Checked timing belt and everything is all okay.
Check the spark plugs and see if there is park on them as the engine is cranked over. If there is spark, then the ignition coils is working. Check the fuel injectors and see if they are getting fuel to...
Question
Misfiring, and we have been told the coil pack has given up. Bought 3 aftermarkets which aren't even letting it run 2012 Sonic 1.6L
Hi there - the coil packs on this model have a design issue, and use of OEM parts, and great care in installation is required. I recommend a engine misfire inspection performed by a mobile, professional mechanic, such as one...
Question
Hello I'm planning on buying this 2005 Acura MDX but one of the issue on the car is that it needs the coil pack replaced. Could yo
The vehicle you are looking at has six individual coils (aka, "coil packs", or "coil on plug") one for each of the six spark plugs on the engine. These are frankly mundane devices and if only one is faulty, if...
Question
How do you know if the ignition needs to be replaced when you replace the plugs on dodge 5.7 hemi?
Hi there. To determine if the ignition coils need to be replaced, remove one park plug wire at a time and hook it up to a spark tester gauge and set the gauge to 10 thousands gap and increase it...

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