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today's update:
Unfortunately, when I started the car this afternoon, the rattle noise was not noticeable, and the screech disappeared suddenly about 5 seconds after start up.
That made diagnosis difficult, but these are the results of my investigations:
1. spark plugs have mild carbon deposits (thin, no build-up) and light gray insulator - consistent through all 4,
2. turbo shaft has little or no play and spins freely,
3. the timing mark on the crank pulley was spot on and stable - this was observed when there was no screeching, but what is the chance that it could have been moving then stop back in the original place?
4. compression was pretty good - 143/152/142/163
5. I tightened the alt and a/c belts, but they were not sloppy
6. timing belt and tensioner are intact and quiet (they were new 3k ago)
I'd be surprised if a crank bearing is failing at 150k on a squirter block, but I'll keep that in the back of my head if it comes back.
I put it all back together and went for a drive - strong boost, no pinging, and no noise except for a slight belt chirp when the a/c compressor kicked in. I tightened the belt again and the chirp is now gone.
I'm not sure what else I can do to identify this problem that no longer has any symptoms. I don't like waiting for it to come on again, but I'm running out of ideas.
anyone else have more?
thanks
joe
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940T Screech and Rattle [900][1994]