Re: Occasional boost problem in 2nd gear - Saab 9000 Bulletin Board - Saabnet.com
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Re: Occasional boost problem in 2nd gear
Posted by zeke (more from zeke) on Wed, 17 Apr 2002 10:48:04
In Reply to: Re: Occasional boost problem in 2nd gear, BillJ, Wed, 17 Apr 2002 09:29:11
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Why those BPC's cost so much is beyond me. And for an item that seems to
fail so often, seems like a better design could have been worked out by
now. The question remains, though, why is this only happening in 2nd?
Maybe this is an ECU question? Boost is programmed to be limited in the
first two gears - I'm not sure exactly, but I think around 10 psi. Funny,
whenever I've had failed BPC's, they gave wild boost - till fuel cut-off!
There are other modes of failure that I've read on this board, too.
Regardless, the BPC valve receives inputs from the ECU to control boost.
The electrical signal causes a vane inside of the BPC to modulate the
pressure to the wastegate actuator. The ECU actually commands the valve hundreds of times per second to control boost.......sounds like it may be either one or the other.....good luck
posted by 134.241....
Posts in this Thread:
- Occasional boost problem in 2nd gear, BillJ, Tue, 16 Apr 2002 20:03:02
- I'd bet on the BPC solenoid..., Bob Davis, Thu, 18 Apr 2002 00:17:29
- Re: Occasional boost problem in 2nd gear, zeke, Wed, 17 Apr 2002 08:30:07
- Re: Occasional boost problem in 2nd gear, Alain(Luxembourg), Wed, 17 Apr 2002 01:45:08
- Re: Occasional boost problem in 2nd gear, julz, Tue, 16 Apr 2002 21:26:20
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