The BPV is not part of boost pressure control... - Saab 9000 Bulletin Board - Saabnet.com
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The BPV is not part of boost pressure control...
Posted by zeke (more from zeke) on Thu, 12 Sep 2002 15:56:25
In Reply to: Boost Experts, JimO, Wed, 11 Sep 2002 19:01:02
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The Hyperboost will not cause excessive boost. Faulty BPC
solenoids will. If you've corrected base boost by adjusting
the wastegate actuator rod with a calibrated pressure gauge
and it is set at about 4.5 psi, then the BPC solenoid sounds
at fault. You probably had a bad BPV, too, and that was leaking
the excessive boost the bad BPC solenoid was producing. BPC
solenoids can go in either direction when they fail - too little or
too much boost. If it fails by giving too much boost, then there's
only the MAP sensor between you and violent fuel cut-off, which
is never that good on your drivetrain. If you have a friend with a
9000, try using his BPC and see what happens. The BPV is
not part of the control circuit or controlled by the Trionic in any
manner, whatsoever.
posted by 12.91.43...
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