FPR Life + Hot Start Diagnosis Conclusion - Saab Performance Bulletin Board - Saabnet.com
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FPR Life + Hot Start Diagnosis Conclusion
Posted by Dave Chicago [Email] (more from Dave Chicago) on Thu, 11 Oct 2007 05:16:00
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I posted a while ago about what seemed to be a hot-start/hot engine problem, (1988 900 T with mods) and thanks for the suggestions.
Turns out it was the 3.0 bar FPR that failed. Fuel was getting sucked by the vacuum hose. So the engine was "rich" but it bypassed the electronics. It was 'worse' when hot or maybe thermal expansion helped open the leak. But the FPR was only a year or two old.
Question: When running higher than stock boost, does the life of the FPR decrease because of increased loads/cycles on the diaphragm?
Good news (sort of): diagnosis turned up low compression which gave me a rationale to put on a 2.1 head! Also, I had the local Saab-only mechanics do the work and they discovered a fuel rail leak I had missed.
posted by 24.136.16...
Daves Saab
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