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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I recently bought a 2005 GMC Envoy Denali and every so often

Customer Question

Hi Dan,
I recently bought a 2005 GMC Envoy Denali and every so often after it sits for 1-2 hours and I start it up it will blow out a puff of white smoke from the exhaust. Is it possible that a bad PCV valve is causing this or is it something else with the engine that I should be concerned with ? It doesn't use a lot of engine oil or coolant which I know are signs of a possible head gasket leak. Please advise,
Dan
Submitted: 2 months ago.
Category: GMC
Expert:  Tims Auto Repair replied 2 months ago.

Hi, My name is ***** ***** for the delay.
I will do my best to assist you.

Expert:  Tims Auto Repair replied 2 months ago.

do you ever need to add any coolant?