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Turbo Bypass valve datapoint.
I had the classic intermittent stalling on decelleration on my '91 200
tq. I checked the control hose for the turbo bypass valve that runs
behind the heat sheild and 4" inches of it were completely destroyed.
New hose made no difference in performance. I sucked on the control line
to the bypass valve and got flow. Blew and no flow. Got a new bypass
valve and you can't blow or suck air through the control port. Installed
it and so far no stalling and the engine rpm's fall more slowly during
shifts making driving much more smooth.
'91 200 tq
Oh, BTW, didn't seem to improve the poor (15mpg) fuel mileage. That's
the next problem to tackle.