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