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bet you are right ... thanks!
Posted by phil94028 [Email] (more from phil94028) on Sat, 28 Jun 2008 02:30:20
In Reply to: locate and check bypass valve....., earthbrown, Fri, 27 Jun 2008 18:13:12
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Saab88 .. google
"saab turbo bypass valve"
and it'll bring up a link to another site ;)
looks like perfect description of the problem
The function of the turbo bypass valve, also affectionately referred to as the "hooter" valve, because of its habit of sometimes making a hooting noise when operating, is to redirect turbo boost away from the throttle plate during deceleration. It prevents a shock wave from forming when the stream of air hits a closed throttle plate that would rebound down the induction tubing and disrupt the flow of air across the air mass meter and hit the turbo's compressor blades and stop or slow its impeller. The result of the shock wave is stalling or very low rpms when slowing down after being in a boost situation.
posted by 79.65.71...
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