Smoke at start up - GreenHybrid - Hybrid Cars


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Old 08-08-2017, 08:15 AM
PRYUKON2008
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Location: ROCKFORD, IL
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Default Smoke at start up

Hey I was wondering if anyone can tell me what could be causing my Yukon to blow out a huge cloud of a white/blueish color smoke from my exhaust when I first start up in the morning. After that it doesn't happen the rest of the day. This just started on Friday, I do have 202,000 miles,
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Old 08-08-2017, 08:46 AM
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Default Re: Smoke at start up

white is coolant.
blue is oil.


Look for a reduction in levels of both. Check cold every morning.


I would suspect weeping head gasket for coolant and valve guide seals for oil.
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Old 08-08-2017, 11:10 AM
PRYUKON2008
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Default Re: Smoke at start up

What am I looking at cost if it is those two things, is worth the fix if the truck has over 200,000 miles?
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Old 08-08-2017, 11:18 AM
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Default Re: Smoke at start up

No idea beyond "not cheap"
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Old 08-10-2017, 12:18 PM
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Default Re: Smoke at start up

Sounds like classic Valve Stem Seals to me. Been a Small Block Chevy "feature" for decades.


If it is you should have measurable oil consumption. So how far on a quart?


Like S Keith said, is coolant disappearing?


If it is stem seals, the Catalytic converter is NOT hot on the first start of the day.





Also, if it is Stem Seals, it's relatively CHEAP. Shop air into the spark plug hole and an over-head valve spring compressor

All subsequent starts a hot Cat masks a multitude of sins.


We had a suburban race boat hauler that would fog real good at the motel in the morning. The rest of the time towing no smoke at all.


Only the morning fog.
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Old Yesterday, 05:14 PM
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Default Re: Smoke at start up

My engine would blow a slight puff of smoke on cold start as well, turned out I had no(low) compression on 2 of my AFM cylinders. Do a compression check on your engine I would suspect oil fouling as it is a common problem with these AFM engines.
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