Detonation Under Mild Boost - A Tough One? - Saab 9000 Bulletin Board - Saabnet.com
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Detonation Under Mild Boost - A Tough One?
Posted by Craig [Email] (more from Craig) on Mon, 23 Aug 2004 08:22:27
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Hi All,
For some time now my stock '87 9kT has been running at low boost. Not quite base boost, but the boost gauge would run up to about 3/4 yellow, stutter as the APC pulls back boost, and settle in somewhere at or near base boost. Pulling the W hose of the APC results in audlible detonation at around 3/4 yellow, indicating that the APC is doings its job and that something else is wrong.
Timing is correct at 16 degrees BTC and retards under boost (about 5 degrees by 5psi, IIRC). The plugs are pretty new and look good. Air filter is fairly new and fuel filter is brand new. PCV valve works.
What on earth could be causing my detonation? She used to run right up to 11psi.
Thanks for any help!
Craig
'87 9kT 279k
posted by 66.15.17...
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