Re: 86SPG misfire & knock at idle? - Saab 900 Bulletin Board - Saabnet.com
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Re: 86SPG misfire & knock at idle?
Posted by tweetiedancer [Email] (more from tweetiedancer) on Tue, 27 Oct 2009 16:03:45
In Reply to: 86SPG misfire & knock at idle?, Jim86SPG_VT, Tue, 27 Oct 2009 15:38:38
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Sounds like a misfiring cylinder. Pull off and reinstall one spark plug wire at a time with the motor running and see if that changes anything. The one that does not change anything is a hint of where to look. I had a situation where one spark plug had a broken center electrode insulator and it fell down and shielded the spark at idle. The motor knocked and smoked like it was ready for a rebuild. I am not sure whether jumping mechanical timing can result in a bent valve, or not. No compression on one cylinder could cause similar symptoms too.
posted by 76.118.111...
Posts in this Thread:
- 86SPG misfire & knock at idle?, Jim86SPG_VT, Tue, 27 Oct 2009 15:38:38
- Re: 86SPG misfire & knock at idle?, Jim86SPG_VT, Wed, 28 Oct 2009 16:24:00
- timing (valve and ignition), air leaks, Siegfried, Wed, 28 Oct 2009 10:11:37
- Has this been the issue since you bought it ?, SaabStalker a.k.a F Myers, Wed, 28 Oct 2009 06:21:49
- Re: 86SPG misfire & knock at idle?, tweetiedancer, Tue, 27 Oct 2009 16:03:45 <-- Viewing This Message
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