Re: Blue smoke on start up. - Saab 900 Bulletin Board - Saabnet.com
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Re: Blue smoke on start up.
Posted by JCB (more from JCB) on Thu, 28 Mar 2002 12:03:34
In Reply to: Blue smoke on start up., Ed F, Wed, 27 Mar 2002 23:13:56
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Blue smoke is usually from oil. Two main ways oil get into the combustion chamber. From above down the valves stems or from below past the rings. A head gasket is another possibility, but white smoke, coolant loss, etc. would be likely. None are cheap fixes (unless you do the work yourself). Neither the valve stem guides or rings must be fixed quickly. It may smoke a small amount for many, many miles. A head gasket should be fixed soon.
First, do a compression test. Head gasket or ring problems will likely give low readings. If OK, you can assume the oil is coming down the valve stem and wait until it gets worse, or the top end needs torn down for another reason (like a head gasket).
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