L26 engine, low mileage, but 15 years old:
When starting in the morning, misfires and spews out white smoke.
Pulling off spark plug leads, it appears that the cylinders 5 and 6 are
the guilty ones. But once the temperature guage reaches 1/4, the smoke
stops and it runs smoothly. So the white smoke usually means coolant
from a buggered gasket. Intake manifold gaskets are a common failure on
old GM3800 engines. But why only part-time problem? Is it possible that
when the engine is hot, the gap in the gasket is closed?
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