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Re: White smoke. (archive)

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Posted by jeff c on September 24, 1998 at 14:47:41:

In Reply to: White smoke. posted by Anatoly Z. on September 24, 1998 at 13:25:39:

I think the fact that it only occurs when the temp is low is indicative of condensation in the exhaust. As your car cools the water vapor in the exhaust and it condenses back to water. This water sits in your exhaust until you start the car again. AS the water heats it turns to steam and appears as white smoke. THis is not damaging to your engine but may lead to premature failure of your exhaust or catalytic converter (if so equipped). Some people have tried drilling holes in the pipes to allow a drainage path for hte condensation.
This is one theory
jeff c

: Hi guys,
: I have a question regarding my '90 BMW 535i, when outside temperature drops about below 60 degrees Fahrenheit white smoke (steam) appears coming out from the rear exhaust. Normally, white steam indicates either failed cylinder head gasket or cracked cylinder head (block). In my case I never add coolant to the system, coolant level remains the same all the time. When I change oil I don't see any coolant in it. So, that must be something else. What could cause this problem???????
: Thank you very much.

: Best regards
: Anatoly Z.
: 90 BMW 535I 80K mi.
: BMW page

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