can a coil on plug system go bad

Asked by Feb 28, 2010 at 12:39 PM about the 2000 Jeep Cherokee Sport 4WD

Question type: Maintenance & Repair

I own a 2000 jeep cherokee sport 6cy 4.0. The engine light comes on periodically and i reset it. I get a p303 error code (bad misfire cylinder 3). Can the coil on plug system go bad?

2 Answers

45

I had my coil packs go out on my cherokee. I had the same code you did. I think i may have had cylinder 3 and cylinder 6 get the error code. I think you can test the resistance on the coil packs but I am not sure on the specific of how to do it

1 people found this helpful.
95

your most common problem that causes this is bad plugs or coils depending on how many miles you have on it i would suggest just replacing both, its not all that expensive and most shops would replace both with a tune up anyways

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