Emissions and Exhaust Systems
Mufflers and Tailpipes
Chevy Silverado

1988 Silverado 12 ton 150000 miles when running a lot of white smoke comes out of tail-pipe It does this when you start it or when driving what causes this?

Answer

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Wiki User
12/15/2006

White smoke is an indicator you have a head gasket leak. The white smoke is actually water or coolant mixing into the combustion chamber with the fuel and air. Have you noticed a bit of a rough idle? Have you looked at your coolant level lately?