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Sounds like the turbo bypass valve might be toast Posted by RS [Email] (#15) [Profile/Gallery] (more from RS) on Fri, 16 Jun 2017 05:44:02 In Reply to: with A/C on, when Rs drop quickly, car stalls, why?, Bobwithasaab, Thu, 15 Jun 2017 20:25:25 Members do not see ads below this line. - Help Keep This Site Online - Signup |
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.
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