if you have a turbo - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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if you have a turbo
Posted by Dean (more from Dean) on Mon, 23 Jul 2001 11:52:58
In Reply to: Loud Crunch Noise, RJ, Mon, 23 Jul 2001 01:08:24
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If it is actually happening when you are on boost and then close the throttle, the bypass valve might not be dumping boost pressure. If so, what you are hearing could be reverse flow shock in the turbo compressor.
Check that the bypass valve vacuum line is intact at both hose barbs. The orignal vacuum line on a 95 will be very deteriorated. Hardened and with the outside surface crumbling. Look for split ends. Check that the diaphragm in the valve is intact. If you remove the 1" discharge hose, at idle, you can reach inside with your finger and feel that the valve is open. Remove the vacuum line and it will close. Do not have your finger in the valve seat when you do this, as it could get pinched.
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