2001 9-5 2.3T Start Up Smoke - The Saab Link Forums

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Old 05-23-2015, 07:51 AM   #1
vjz
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2001 9-5 2.3T Start Up Smoke

Kind of back in the Saab game. My brother picked up a 2001 9-5 2.3T with 79,000 miles on it. Clean as a whistle.

Blows a puff of bluish white smoke on startup.

It came with a warranty, so we took it to a shop to try and take advantage of that. The tech said it's the valve seals. Compression test was fine.

I have read more about the turbo itself going bad. The car runs and drives like it's brand new, as it should for the low miles. The inside looks like it's never been sat in.

I think they're going to go ahead and do the valve seals, but I'm always skepitcal, and it's been a while since I've tinkered with these cars.

Any thoughts are appreciated!
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Old 05-23-2015, 08:13 AM   #2
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Sounds like it's likely valve seals to me. Bad seals in a turbo let oil into the exhaust gas stream that's already burnt and headed out the tailpipe; an immediate puff of burnt oil smoke from a cold engine means it's being combusted right then (not cooking off inside a hot exhaust system/cat).
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Old 05-26-2015, 09:54 AM   #3
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I've seen a turbo do this too, and it's easy to check.

Park it where you can get at it and let it sit overnight.

In the morning or sometime the next day, unbolt the downpipe from the turbo, and slide it back enough that you can get a little inspection mirror in and look back up at the turbine wheel. A little bit of wetness under the wheel is ok, but if you see a little pool or a drip of oil coming from under the turbine wheel and making it's way farther down into the housing then the oil seals are starting to weep.

Sometimes they weep so little that while running there's no or very little visible smoke from the exhaust, just that puff on start-up from what's accumulated in the bottom of the turbine housing.

If it looks dry, go ahead and let them monkey with tearing down the head.
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Old 05-26-2015, 11:49 AM   #4
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+1 on both valve stem seals or turbo, turbo especially if its a GT17.
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