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Pssst or Hiss noise when changing up the gears

4631 Views 5 Replies 5 Participants Last post by  JD
Hi, I have a 1996 9000 CS 2.0 LPT When I change up the gears (slightly under torque), there is a hiss noise coming from somewhere in the engine bay. It sounds like a pressure releif valve type hiss, but I'm not sure, and I'm a bit concerned
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Not sure if this is relevant but does the LPT have a Dump Valve on the Turbo? if so it could be this that your hearing as it drops the waste boost? if not you have lots of 1/8th bore vac. hoses, check these especialy where they terminate or join, my wifes split a a "Y" joint & exhibited a loss of boost on the turbo/apc gauge.
Regards paul
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