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1985-1998 [Subscribe to Daily Digest] |
...that is, the 'turbo bypass valve' and the 'BPC solenoid' are two different things.
The overboost problem you are experiencing is related to your BPC (Boost Performance Control) solenoid (valve), which is the black cylindrical object with three hoses on it, located on top of the radiator fan. Erik K describes a proceedure where you clean out the BPC valve by removing it completely from the engine bay and spray some kind of cleaner into one of the holes and then shake it out. This might solve your problem.
The power cutout that you describe is the overboost switch kicking in and shutting off your fuel supply to protect the engine. This is not a desireable condition! Too much boost can destroy your engine all at once. The BPC valve is controlled by the ECU, and functions to keep boost at reasonable levels in all driving conditions.
The turbo bypass valve is a separate component that is located behind the BPC solenoid. It has a single small vaccum line connected to it and is attached at right angles to both the silver intake pipe that runs up the driver side of the engine bay, and also down to the black rubber intake pipe that connects to the turbo. This component can be tested, as nick describes, by disconnecting and sucking on the small vaccum line. If the line holds a vaccum, then the valve is good.
The bypass valve functions to 'blow off' excess boost pressure during shifts. However, this is not realted to your problem.
For more information on these devices, visit http://www.quasimitors.com. This is an excellent site with information useful to all Saab 9000 owners.
Good Luck!
-Kyle
'91 9000T
posted by 24.60.14...
1
, Mon, 19 Aug 2002 01:09:25
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