Throwing code for the 4th ignition coil was misfiring?

KOTTENKANDY

MEMBER
2008 CHEVROLET HHR
2.4L
4 CYL
2WD
AUTOMATIC
193,000,000 MILES

My car was throwing code for the 4th ignition coil was misfiring, and I changed the ignition coil and spark plug for #4 and it kept throwing the code so I replaced it thinking it was just a faulty one, but it is still throwing the code.

Monday, June 27th, 2022 AT 7:55 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,389 POSTS

When you replaced the spark plug did it look okay? Also, how does the engine run? If the cylinder has good compression, you probably have a bad fuel injector. These guides can help, and I have included directions in the diagram below to help you change the injector out.

https://www.2carpros.com/articles/how-to-test-engine-compression

and

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Monday, June 27th, 2022 AT 2:20 PM

KOTTENKANDY

MEMBER
2 POSTS

The old spark plugs just looked worn out and the engine is just loud and sounds like it is going to stall but never does. You can tell it's misfiring, and the check engine light is flashing. I will upload a video in the morning.

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Wednesday, June 29th, 2022 AT 8:34 PM

KEN L