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Bad BPV that passes all the tests?
Posted by LDH (more from LDH) on Wed, 19 Sep 2001 22:10:51
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I've been slowly working through troubleshooting a not-smooth driving '95 Aero. It just seems to stumble/jerk intermittently under light loads. Runs wonderfully at WOT, aside from that damned annoying fuel cut similar to Bill Cannastra's.
Anyway, the jerkiness was getting slowly worse, just enough to bother me. It's better now with new plugs, but still there. The problem is most noticable, as I said, under light acceleration and at zero throttle. Most recently (last week or so), I've been noticing that sometimes the engine will really lug as I come to a stop -- revs drop down to 500 or so momentarily. But not always. And its fine driving around at 1000-1250 revs in 1st or 2nd gear, but gets jerkey if I let off the throttle at all.
This is beginning to sound like a bypass valve problem, but mine seems fine by all rights. It passes the suck/blow tests and makes a quick, loud PSSSHT noise at every shift when under load. I'm not positive, but I think it may begin leaking a little under WOT at high RPMS. None of that seems consistent with a sticking BPV.
Am I off base here, or is there a chance that the BPV could actually exhibit this behavior? I wish I had a second Saab that I could easily swap out the valve from, but I don't. My only other thought is that this is the TCS system acting up, but that'd take a dealership to diagnose, wouldn't it?
BTW, DI Cassette, upper and lower motor mounts, vacuum hoses are all new.
posted by 151.201....
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