2007 Envoy V8 5.3L

Asked by GuruT95W7 Jun 08, 2018 at 10:48 AM about the 2007 GMC Envoy Denali 4 Dr SUV 4WD

Question type: Maintenance & Repair

My GMC has smoke competing out of exhaust, rough idle,
bucking at take off, and a flashing engine light that read
misfire on cylinder 6. Repalced spark plug and coil pack
but still doing it. I have heard it could be one of two
things head gasket or lifter. I do not seem to be losing
any antifreeze. Could this be something simpler?

4 Answers
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oilyspill answered 6 years ago

Check fuel--spark--compression on that cylinder. Was the smoke black? If so, check for over-fueling. Use a gage and check proper fuel pressure and see if pressure holds for a bit with key off. The basics for rough idle, check for a leak of some kind, right now I'm thinking fuel.

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27,570

oilyspill answered 6 years ago

Maybe coolant getting into combustion chamber because of bad gasket? Are you losing coolant?

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Rachel answered 5 years ago

I have an 07’ GMC Envoy Denali 5.3 as well and it’s literally having this exact problem. It started yesterday. I have to take it to my husband on his lunch break to fix but I’m trying to locate cylinder 6 before I even take it so he can get right to it. Can anyone tell me where it is? Is it on top or am I going to have to do some digging?

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