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Still fighting this... Fixing the PCT valve and vacuum leaks made no difference.
Today it got worse. Or repeatable, which may be better. Left the house, drove ~1/2 mile, and it stalled as I pulled up to a stop sign. Tried restarting in neutral, multiple times, it would fire, rev up to 2-3000 rpm, then back down to zero and stop. Repeated this 15-20 times with gas pedal in various positions, same effect. Sometimes would run badly at idle, and stall whenever I stepped on the gas. Eventually I shut it off, opened the hood, peered around for anything noticably amiss, (all appeared in order,) shut the hood tried again, and it started and ran just fine, like nothing at all had happened. Drove fine to work, ~25 miles.
Coming home, same scenario. Drove ~1/2 mile and it started running poorly. Drove another 1/2 mile, and it stalled. Exact same scenario. Tried putting into park and turning off completely, but this time no change. (Must have been random correlation this morning.) Eventually, after 15-20+ attempts, it started and ran, and ran with an occasional miss all the way home. Had 2 stops to make on the way home, and both times it started and ran fine.
I'm suspecting heat related.
I talked to an independent mechanic, (was going to take it by and pay him to help diagnose,) and over the phone he agreed that I had addressed the first suspects (replaced MAF, Cam Sensor, vacuum elbows and leaks.) He said he had another 850 in the shop doing the same thing, and they had not yet witnessed it. He recommended that the Crank Sensor was the next item to replace.
Scanning through Brickboard here, it sounds like a few others have cured similar woes with a crank sensor. Thus, that's the next thing to do. Stay tuned...
Roger
'95 850 Turbo Sedan, 246k miles
'87 245 M47 289k miles, still getting 28mpg and still going
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