second the bypass valve... - Saab 9000 Bulletin Board - Saabnet.com
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second the bypass valve...
Posted by Jan Geert [Email] (more from Jan Geert) on Tue, 3 Apr 2007 10:37:49
In Reply to: Is it a turbo?, turrbo [Profile/Gallery]
, Mon, 2 Apr 2007 23:20:49
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The reason why a bad turbo bypass valve will cause stalling is that, when coming to a stop, the throttle will be closed (=foot off the gas). the pressure from the turbo will hit the closed trottle plate and send a 'shockwave' back which can result into reverse pressure on the exhaust manifold causing a stall.
The bypass valve should prevent this.
Opening the idle control valve will partly cure the symptoms since the pressure from the turbo will find is way past thte throttle plate through the valve into the intake, at least partly.
Test that bypass valve and replace when bad.
Jan Geert
The Netherlands
posted by 145.7.18...
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