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Dan89_930 Dan89_930 is offline
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Join Date: Mar 2008
Posts: 7
Quick recap of the problem - the car sat in the seller's garage for the last 5 years - probably closer to 7 years. When 930's sit without being driven, belts, hoses, gaskets, seals, etc. can fail. At best, most will not function properly.

Until the motor was running nice and warm, I could not get charged air (boost) into the motor. Once the car was warm, boost was mostly normal.

The problem (no boost until the engine got really warm) wasn't the wastegate or the turbo. There is an aluminum alloy tube / pipe / housing that connects the turbo to the intercooler - it called the "valve housing". Inside the valve housing is a piston that slides up and down the housing - its purpose, as I understand it, is to regulate the amount of charged air into the intercooler before, during, and after the engine warms up. The warmer the engine, the more charged air is allowed into the intercooler (not sure this explanation made complete sense, but that's how my mechanic explained things).

At both ends of the housing are "O" rings / gaskets. Because the car had sat for so long, these "O" rings became brittle and cracked and failed. The mechanic took apart the valve housing, found lots of little pieces of those "O" rings and determined the little bits and pieces were causing the piston to not function properly. The mechanic clean up the housing, replaced the "O" rings, reassembled everything and the car now runs perfectly.

I had never heard of this before. I thought it was just a straight shot from the turbo to the intercooler. Interesting, eh?

Old 06-10-2008, 03:19 PM
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