Question about 2004 GMC Sierra 2500

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2004 GMC Sierra 1500 blows a cloud of smoke only at startup

After startup there is no smoke. It only does this on a cold morning or after not driving fo more than 24 hrs. What could be causing this?

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  • Chris Kieninger
    Chris Kieninger May 11, 2010

    what color is the cloud? black or white?


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If it's the org. engine it will has over 60,000 miles on it.
It's normal to has the valve stem seal/oil seal on the head to leak oil into the cyclinder.

The smoke you see is the motor oil drop from the valve stem seals.

It land on the top of the cyclinders and it create black smoke at start up.

The inexpensive fix is to start using high mileage oil with seal conditioner.
This will help soften the rubber seals and help reduce internal oil leak.

The correct fix is to wait until it's time for a head gasket replacement and let the professional service the head.

Complete head service is the only method to stop this internal oil drip problem.

Posted on Aug 24, 2009

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