Vacuum leak? Bad tank of gas? - Saab 9000 Bulletin Board - Saabnet.com
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Vacuum leak? Bad tank of gas?
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Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Thu, 7 Jul 2005 07:55:10 Share Post by Email
In Reply to: light knocking when hot, Tiziano, Thu, 7 Jul 2005 05:30:52
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Recently, my car was knocking at low speeds when I would accelerate even moderately. A new tank of premium gasoline fixed my knocking problem, car now runs great. Heat will increase knocking, which is caused by preignition of the mixture, triggered by a hot spot - did you clean the carbon off of the head while it was out?

The problems at startup may be due to a vacuum leak or the previously mentioned bad gasoline. If you are not seeing smoke, the 10W-40 oil is probably fine. Check all hose connections for coolant leaks.

Yes, it's very possible to get a bad tank of gasoline - water can get into the gasoline retailer's storage tanks (either accidentally or on purpose!), which does not help the octane rating.

posted by 136.182.2...

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