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Blowing Smoke

Va2500HD

By Va2500HD
in Ask A GM Technician

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Va2500HD Enthusiast

Va2500HD

Posted
Posted

2002 2500HD 6.0

 

I know there may be numerous possibilities, but I am looking for any input...I don't drive my truck everyday and after it sits for a few days and I start it it blows white smoke right after start up. It is only a short burst and it does not reoccur on subsequent startups after it has been run, only after it sits for a few days. Any ideas? Thanks in advance.

jlcallaway Enthusiast

jlcallaway

Posted
Posted

It kind of sounds like you are getting some leak by of oil at the valve guides. You didn't say how many miles are on the truck. If only for a short period it can't be very much. Is your oil consumption up and I assume you have no anti freeze leaking.

 

JoJoJim

Va2500HD Enthusiast

Va2500HD

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Add

 

70,000 miles. I searched some old posts and should add that last summer 2006, right before a long trip, DIC posted low coolant. Already on the road heading out of town I stopped by the dealer and they just topped off the coolant. I've changed oil a few times since then with no apparent "milk". What I have noticed is a small leak coming down on a 1/4-3/8" dia steel tube visible from under the truck. Similar tubing is visible from top side of engine compartment coming from coolant resovoir. No leakage makes it to the ground and coolant level has maintained since summer 06.

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Searching info seems to point to head gasket. Any feedback?

Really need to know if the "smoke" is coolant or oil related to go much further with a diagnosis. The low coolant issue seems to have been quite a while back. Somebody mentioned valve guides. I know on older GM engines (as they got older) the valve stem seals would allow small amounts of oil to get by and puff smoke on startup but I haven't heard of this on newer trucks.

 

An oil analysis would show whether or not you have excessive coolant in the oil. A compression test might reveal a bad gasket.

 

Just guesses at this point.

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