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Sounds like the turbo bypass valve might be toast
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Posted by RS [Email] (#15) [Profile/Gallery] (more from RS) on Fri, 3 Dec 2021 04:51:49 Share Post by Email
In Reply to: Wants to die after throttling, Phoebe, Thu, 2 Dec 2021 14:46:59
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also called the hooter valve.

It redirects turbo boost away from the throttle plate during deceleration and prevents a shock wave from forming when the stream of air hits a closed throttle plate and reflects back to hit the turbo's compressor blades and stop or slow the impeller.

To check it, find the vacuum tube that goes to the TBV from the intake manifold, pop it off the vacuum nipple and suck on it to see if it holds vacuum. If it doesn't hold vacuum, it's toast.

https://www.saabnet.com/tsn/bb/900/index.html?bID=453603

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