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Where Did My Boost Go ? 850 1997

posted by  vesparally on  Sat Mar 18 17:27 CST 2023
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last visit: Tue Oct 21 18:11 CST 2014
[RELATED]

1997 850 GLT (LPT) 200K miles

Car is down on power, acting like my old NA 850.
I can hear what sounds like boost pressure leaking from some where when I am accelerating.
Not seeing any bad/blown hoses from the turbo to intercooler to TB intake.
Do intercoolers even go bad? I'm see a small hole with a smudge of oil around it at the bottom low point of the intercooler. Weep hole ???

I attached a vacuum/pressure gauge to the vac. tree (no stock "boost" gauge) and I get a reading of around 18" of vac. at idle, 9" at cruise & 0" of vac. at WOT, normal?
Is there an easy way to attach a gauge to measure actual/real boost pressure ??

Sort of sounds like the wastegate is stuck open, but I don't think that's it.
Can't reproduce the sound unless under load (driving).
Will fabricating a way to manually add some low PSI to the TB intake hose be a viable way to listen for a leak ???

What are the most likely places I should be looking at.

Thanks
Peter





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