hesitation/backfire in 1979 99 - Saab Vintage Models Bulletin Board - Saabnet.com
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hesitation/backfire in 1979 99
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Posted by Jon Butzke (more from Jon Butzke) on Thu, 3 May 2001 00:01:21 Share Post by Email
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I have a 99 that seems to be lacking in power recently. It does not accelerate like it used to and tends to backfire whenever I lift off the gas from a high rpm.

Details: The car was rolled a few months back and has been working for about a month now. It sat upside down for several hours. Today I replaced the air filter and cleaned the throttle body and intake manifold of a large amount of oil that has evidently been in there for the last month. Compression in all four cylinders is about 165# in each. Brand new spark plugs, old ones had dry black coating on the insulator and whitish on the ground electrode.

What else can I check? what might be causing the problem. My initial guess was that something was causing the mixture to be too rich, but am at a loss as to the underlying cause.


Thanks,
Jon

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