Date: Sun, 09 Jan 2000 13:23:54 -0600
From: Mark Plumlee <>
Subject: Re: '90 900t spg turbo boost probs(?)

apc is in driver fender well, its the black box... joe wrote: > I agree, additionally a plugged exhaust or excessive backpressure shoulnt > give you really low boost, but rather alot of charging lag, although it > might - but a couple of cracks would seem to indicate less not more. Try > this...go to a u-wrenchit type of junkyard, locate a turo saab, and remove > the APC computer (located under the left side passenger seat, swap 'em and > see if it makes any difference, if so live w/the used one or go buy an SPG > red to replace the one you've had. This seems unlikely but something's > wrong... > > "ben gurion" <applescript.collectnopsamnet> wrote in message > news:1e431tz.g864zu1n98yc0N%applescript.collectnopsamnet... > > Nick Passino <> wrote: > > > > > My '90 900t SPG is acting a little weird on when the turbo boosts... > > > sometimes it'll only creep up just into the yellow about 2mm and stay, > > > but if you are in a low enough gear and and punch up the revs, then > > > suddenly it'll boost all the way up to it's normal end range (right b4 > > > the red). > > > > Sounds like a problem in the APC and/or the parts involved in controling > > the turbo (which seems to be very common) ... > > Before digging that way, check your turbo, by dissconnecting the right > > vacuum tube (looking fwd) from the solenoid valve, which is located on > > the right upper edge of the radiator ... its a little round thing with 3 > > vacuum lines and two electric lines connected to it. > > > > Now warm up the car, and do some hard accelleration, BUT: > > CAUTION ! Doing this, with the disabled APC means YOU are in control of > > the boost, so do it carefully and avoid shooting it into the red for too > > long or too often.... you'd fry your engine ! (which isn't easy, cause > > you sure never felt _such_ a kick before ;)) > > If your turbo is ok, the boost will go up fast and as high as you let > > it. > > -- > > cu... > > ben

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