Fuel cut - BPC valve - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Fuel cut - BPC valve
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Posted by PM (more from PM) on Wed, 6 Apr 2005 19:11:04 Share Post by Email
In Reply to: Accleration cuts On and Off when aggressive??, Joe [Profile/Gallery] , Wed, 6 Apr 2005 13:53:45
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It's called a "fuel cut". The boost gets too high because the BPC is not doing its job. The car computer (ECU) interrupts the flow of fuel to the engine for a moment. Then the fuel is restored and car seems to lurch forward. Can happen two-three times in a row before it stabilizes again.

Most common cause (unless you have made mods to increase the boost), is a dirty or failing BPC (boost pressure control) solenoid valve. My mechanic cleaned mine (blew it out using compressed air), and problem was fixed. A new one is around $200 on eEuroparts.com, but usually blowing the crud out of the ports does the job. Some people clean them out with solvent, but I never tried that.

If one of the hoses connected to it cracks or clogs up, you can have the same symptom, but that is unlikely on a car with 41k miles.

Search for "fuel cut" or "BPC" here or on the NG900 board for more info (early 9-3 models have the same issues as the NG900).

posted by 68.249....

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