04 GMC Envoy misfire with no check engine light

Asked by shantem77 Apr 05, 2015 at 04:17 PM about the 2004 GMC Envoy 4 Dr SLE SUV

Question type: Maintenance & Repair

I have a 2004 GMC Envoy. I recently replaced the spark plugs with AC Delco iridium spark plugs. I can feel a misfire with engine at idle and while driving, but there is no check engine light. How do I determine what is causing the misfire with no check engine light

3 Answers
30,500

mikeatpriestlake answered 9 years ago

have the computer scanned anyway. sometimes a code is stored. also, it is possible your light itself doesn't work. happens.

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Mario answered 9 years ago

It can be a million things. Check fuel pressure and spark. If it was a misfire you would would have P0300 codes

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Steve answered 6 years ago

did you ever find the issue. I am having the same thing. Seems like a misfire at idle and under load, but no light and no stored or pending codes. I recently bought the vehicle and the previous owner had just had all new coils installed. Seems worse in wet weather, however that is usually a spark plug wire problem, which clearly is not the case here.

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