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Originally Posted by InsatiableAmos
when under boost, if I lift off the throttle even moderately quickly I get a brutal hard engine-braking-style lurch.
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Yeh, that doesn't sound right. You should be able to feather the throttle - or even just close it with a bang - and have "normal" engine braking/deceleration.
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Originally Posted by 908/930
Is there a chance your boost pressure switch is turning the fuel pumps off?
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Yeh, kind of what it sounds like. Based on what others have said, as my car hasn't had an overboost switch connected to anything in my ownership...
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Originally Posted by 908/930
Intake recirculation still in there?
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Another possibility; if the recirc valve dumps to atmo on CIS, doesn't the mixture go overly rich because you've dumped all the metered air or something? Thinking it might go so rich it can't run anymore...