Date: Sun, 9 Jan 2000 01:06:47 -0600
From: "joe" <>
Subject: Re: '90 900t spg turbo boost probs(?)

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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