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Please help - Rapid Chattering during high boost.
Posted by Rob '86 SPG (more from Rob '86 SPG) on Thu, 1 Sep 2005 17:16:26
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Hello,
i have a bear of a problem, and I can't seem to track it down. My '86 900T boosts fully and properly with it's stock red-box APC, but as it reaches around 12+ psi, a rapid and un-uniform chattering / ticking noise occurs which appears to affect the knock sensor, thus slightly cutting back and forth the boost to the red line on the gauge. I am concerned it is head noise/timing chain issues, but it doesn't make sense to me as during high rpm's without boost, the noise is not present. The culprit isn't APC solenoid, I have tried another known good unit with no change. How would the presence of high boost effect the workings of the cylider head? (if at all)
Thanks so much for reading this! Happy SAABing,
-Rob
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