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white smoke


powerdrill
04-03-2008, 03:04 PM
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
04-03-2008, 03:20 PM
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
04-03-2008, 04:25 PM
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
04-03-2008, 05:29 PM
Fel-pro makes an updated exhaust valve seal.

Exhaust: http://info.rockauto.com/Fel-Pro/Detail.html?SS72526_TOP.jpg (SS72526)

Intake: http://info.rockauto.com/Fel-Pro/Detail.html?SS72527_TOP.jpg (SS72527)

//2000CAYukon

PeteA216
04-03-2008, 09:23 PM
I replaced them on my '89 with the umbrella style valve seals about 7 years ago. Worked like a charm.

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