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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Stock motor or modified? Did this start just suddenly one day, or has it slowly been coming on and getting worse over time?
Since it seems to be boost related, I would suspect maybe the WUR is faulty and dropping control pressure too far - going too rich. Or, maybe a simple vacuum or air leak which would result in the same thing (rich on boost). Other possibilities are weak or erradic spark.

You're gonna have to get some readings on things like control pressures, AFR/CO%, ignition timing, plug condition, intercooler O'rings and pipes/hoses for leaks, to help narrow down the fault.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 12-13-2009, 09:25 AM
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