Sounds like a bad BPC. May only show up on full power. - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Sounds like a bad BPC. May only show up on full power.
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Posted by Noel (more from Noel) on Thu, 14 Nov 2013 07:07:27 Share Post by Email
In Reply to: Re: Max boost fuel cutoff - BCV?, 900Fun, Thu, 14 Nov 2013 06:13:40
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A '99 model year is likely still running a T5 ECU and BPC. These are more failure prone than the later T7 versions and can die exactly as you describe. I've went through several BPCs on my 9K before I had the ECU modified and put in a T7 BPC.

The older BPCs fail by either allowing the engine to overboost and hit cutoff, or by limiting you to base boost. Either way, the BPC is likely a goner. You can try spraying some electrical parts cleaner into the thing, letting it set a minute and shaking it, emptying out, drying, and reinstalling. May or may not help. Some say dish detergent or Simple Green, followed by a rinse with electronic parts cleaner works. But you're likely going to end up getting a new BPC.

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