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1990 GMC Sierra Smoke

Tiny
MNO221
  • MEMBER
  • 1990 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 270,000 MILES
When I frist start my truck after beeen setting for a while a puff of blue smoke come out the tailpipe and then that it. It don't smoke when i'm driving and there is no oil in the tail pipe, just a puff of smoke on the start up.
Friday, February 27th, 2009 AT 1:34 PM

1 Reply

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
With 270000 miles, a blue puff of smoke at start up is normal. Oil probably leaks down from the valve seals after the engine is shut down, causing a little oil to sneak into the combustion chamber. Unless you are consuming a lot of oil, meaning your oil is low all the time -- I wouldn't worry about it. Unless, of course, you want to rebuild your engine? Engines do not last forever - and 270000 miles on V8 is a good run.
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Saturday, February 28th, 2009 AT 6:58 AM

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