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1kz excessive white smoke at idle - 2002 GMC Sierra

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Posted on Jan 02, 2017

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SOURCE: I have a 1997 gmc sierra 5.7 vortec, just changed plugs and wires, now it hiccups at idle, And excessive white smoke and gas smellout the exhaust any ideas?

If you have white smoke out the tail pipe you have a problem with antifreeze entering the fuel system and burning with the fuel .
You see the white smoke isn't smoke its steam from the water in the antifreeze .
Witch leaves with 1 of 2 problems head gasket or intake manifold gasket .
Being that its a chevy engine I would say its the intake manifold they have had a problem with this disgin for over 30 years not enough bolts to much glue .
Over heat this engine once the glue melts and it starts leaking because of the pressure .
The bigger problem you have is if you run this engine the antifreeze will get behind the pistion rings any wreck the engine in under a month.
So do something quickly if you want to save it
Good luck

Posted on May 13, 2015

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