I have already searched the archives and only found minimal mention of the bypass valve for the Mitsubishi turbo. I am suspecting a problem with the one on my 745t. On acceleration there is a rattling sound from the area of the turbo which becomes much more pronounced when i let off the gas. I am NOT talking about pinging here...this sound is from the area around the turbo, not the engine. There is no sign of smoke or any oil usage so i am very doubtful that there is any problem with the turbo itself...last time I checked(fairly recently) play in the tubo was almost non- existant. Another problem that may or may not be related is a hesitation on acceleration. The car accelerates nicely up to up to a point and then kind of hesitates for a split second and will then will continue accelerating. I'm guessing here, but maybe the bypass valve is releasing some boost pressure and that is causing the hesitation? Any suggestions?

dan

p.s. I understand that the bypass is external to the turbo on my '87...any info on where it is and what it looks like? Haynes mentions nothing.