white smoke

[powerdrill]

1988 sierra with a 350 2wd, at start up blows white smoke for about a second or two... don't have a clue why. need some replies... Thanks

[2000CAYukon]

Are you sure it is white and not light blue? The early TBI years are notorious for light blue smoke at start up due to a bad exhaust valve seal design. It only used an O ring and they crack over time.

White smoke is usually water/coolant so it could be a leaking intake manifold or head gasket.

//2000CAYukon

[powerdrill]

i went outside and turn the truck on... 1st time today, and your right, it is a very light blue smoke, not white... it only smokes when cold, 1st start up... so what do i need to do to replace the o-ring?

[2000CAYukon]

Fel-pro makes an updated exhaust valve seal.

Exhaust: http://info.rockauto.com/Fel-Pro/Det...S72526_TOP.jpg (SS72526)

Intake: http://info.rockauto.com/Fel-Pro/Det...S72527_TOP.jpg (SS72527)

//2000CAYukon

[PeteA216]

I replaced them on my '89 with the umbrella style valve seals about 7 years ago. Worked like a charm.