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Mysterious woosh/hiss from dash? 200 1981

posted by  someone claiming to be Joe Schaefer on  Tue Aug 27 11:33 CST 2002 [RELATED]

Hello everyone,


My 1981 240 Turbo makes a strange sound from behind the dash when you step on the gas. The sound usually occurs when I let the engine build vacuum and the tap the gas quickly. This "woosh" can then be heeard for about a second. The sound almost sounds like that of a turbo blow-off valve. What could this be? A vacuum line broken? A leak in the HVAC vacuum reservoir? Any ideas would be greatly appreciated.

Thanks a lot,

Joe Schaefer - 1981 240 Turbo w/232k miles, 1988 760 Turbo w/226k miles.





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