Date: Fri, 23 Jul 1999 09:01:35 +0100
From: "Jagdev Singh" <>
Subject: Re: 9000 turbo problems

Sounds like dumpvalve diaphragm has developed a leak. The noise you hear is the boost escaping into the atmosphere. The dumpvalve is the black plastic thing attached to the aluminium pipe between the intercooler and the throttle body. It takes 2 mins to test - blow into the (thin) pipe attached to the top of the dumpvalve, the air should not escape, ie it should be air tight. If the air does escape, replace the dumpvalve. They are relatively cheap. Jag. Jason Ahmad wrote in message <>... >Hi, > >I have a '90 9000 cd turbo w/about 150k miles on it. A few days ago, I was >pulling onto the freeway when all of a sudden the turbo whistle got way >louder than usual and the car started going way slower than usual. Now, >whenever I try and accelerate enough so the boost gauge goes into the >yellow, it whistles loudly but seems to slow down and buck a bit. >Accelerating slowly (ie, no boost) is no problem. Additionally whenever I >attempt to accelerate quickly, the car emits rather nasty fumes. > >

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