How To Lower ignition coil replacement cost and how to do ignition coil test

Posted by HJL_ADMIN 1 on



If you have a faulty ignition coil, your engine will not run properly. Even worse, it may cause the stalling.
Like spark plugs, ignition coils are essential to a fully functioning engine. And it can slowly wear and fail over extended periods of time. With symptoms which similar to the bad spark plugs, faulty ignition coils are a fairly easy issue to diagnose and solve.


As such, it is important to know how to identify bad ignition coil symptoms. Ignition coils must be in good condition and performing properly for a vehicle’s engine to start smoothly.


Common Symptoms of a Failing Ignition Coil


Most engines have at least four ignition coils, sometimes grouped together in a coil pack. If you have problems with your car’s ignition coils, it could affect your car’s performance.


Difficult Start Engine:


The most generic symptom of ignition trouble is that the engine doesn’t start. You may get your vehicle to crank its engine and have difficult to start if the ignition coil is having trouble.


Check Engine Error Codes:


Spark and ignition issues will likely throw a code that signals the check engine light to illuminate. The easiest way to understand why an engine light is on is to use an OBD-II (on-board diagnostics) to check.

Different error codes will give you the information about what’s going on exactly.


Engine Misfiring or Stalling:


If your engine misfires or stalls when you idle the car or accelerate, there could be a problem with your ignition coil.

The reason to cause the misfiring is the weak spark of the coils.

A failed ignition coil can also cause the car to idle rough or inconsistently.




How To Diagnose and Test An Ignition Coil

First of all, you can check for ignition coil problems by running an OBD-II diagnostic tool, which will require an OBD-II scanner. Codes P0300 to P0312 indicate engine misfires, while codes P0350 to P0362 are for ignition coil issues.


The location of the ignition coil varies from vehicle to vehicle, so check your vehicle’s user manual or use a search engine to find where your car’s ignition coil is located. Again, take suitable precautions preparation to make sure you don’t electrocute yourself.



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Secondly, park your car on an even surface, turn your car off, and allow it to cool down. Use your OBD II scanner tool to find out what’s going on.
You’re also welcome to check this video as we list out more details for ignition coils diagnose and the meaning of error codes.


And then, remove the ignition coil which is failed; it’s also recommended to replace all coils as the remaining ones may fail sooner or later.
Meanwhile, it’s a good idea to inspect the spark plugs for damage.
If the plugs haven’t been replaced for long time, replace them, as well.



What's more, it is necessary that inspect the housing for cracks, holes, dirts or any other damage. They could be the source of your issues.



When the engine is cranked, you should look for blue sparks between the spark plug gap.
If you can see blue sparks, this proves your ignition coil is working correctly. If you don’t see blue sparks or you see orange sparks, this is a sign that there’s a problem with your ignition coil.



After the previous steps, you will now know if your ignition coil is faulty or not.

If you aren't confident about fixing the issue yourself is to simply take your vehicle to the shop.

Testing an ignition coil can be dangerous if you don’t proceed the processes correctly.
That’s why we always recommend car drivers to get the help from a qualified specialist.



Questions you will want to know about ignition coil


Do ignition coils get weaker over time?


Although most ignition coils are long lasting and reliable, it’s still a mechanical component that can get weak.

A weak coil can be the cause of under-hood havoc. The good news is, it can be repaired easily and last long after the replacement.


Can I drive with a failed ignition coil?


Yes, it’s possible to drive with a bad ignition coil, but not advisable. Driving with a faulty coil pack can damage other components of the engine. You may not feel any difference, but deep inside, it could cause serious harm to not only the engine cylinders but the rest of the components as well.


Can a bad ignition coil cause a misfire?


Absolutely yes!
One of the faulty coils' earlier symptoms is that the vehicle will experience misfires.
In some cases, the performance issues may even result in the vehicle stalling.
If you observe continuous misfiring, get it inspected by a mechanic as it may also damage other engine components.


Is a Spark Plug Part of an Ignition Coil?


No, the spark plugs and ignition coils aren't the same, they are two separate parts. The ignition coil feeds the spark plug high voltage.

And yes, they're both parts of a vehicle's ignition.
In other words, part of a gasoline-powered vehicle's ignition system.


If you know the ignition coil is faulty in your car, it is very important to take your car to a repair shop for further inspection.
Many problems usually start with small things and ignoring the signal can lead to more serious problems and higher maintenance costs.


Alright, I hope this article can help you,

you can follow more information from HJL on our blog.

Do you have similar problems?

Contact us to share with us your experience.


Related Reading:
BMW X3 03-10 engine N52/N54 Top Common Problems



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