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Date: Sat, 19 Sep 1998 20:12:13 -0700
From: Justin VanAbrahams <jvanabranopsamnet>
Subject: Re: Turbo Boost problems


Jim Collins wrote: > > In article <35FDA1C5.579nopsamnet>, jvanabranopsamnet says... > > Paul Aspinall wrote: > > > > > > I have an 89 9000 Carlsson. I have had problems with Turbo boost for a few > > > months now. The car seems to imtermittently reduce itself to basic boost for > > > no reason (ie. the boost guage moves half-way into the yellow). > > > Occassionally I do get full boost (all the way into the yellow), but it is > > > quite rare. > > > > > > I have changed plugs, air filter, cleaned injectors, tried new boost > > > solenoid - but no luck. > > > > > > Has anyone had this problem, or can anyone help??? > > > > > > Thanks > > > > > > Did you try a new APC box? That would be the next place to > > look. Either than or a vacuum leak. > > > > The APC box is the *sole* controller for boost. It interacts > > directly with the APC solenoid, so if you're getting basic > > boost, it's 'cause the APC box said so - given that the > > solenoid itself is good. > > > > Now, things that will normally cause basic boost are a > > failed apc box, a failed knock sensor (may give the > > *illusion* of basic boost) or the cruise control system > > being engaged or malfunctioning (check the pop-off valve > > near, the clutch & brake pressure switches, and the > > cruise control 'ecu' itself). > > > > My money is on a bad APC box, though. > > > > -Justin > > > I had this problem on my '87 900T and the fix was free....I don't know if > your car is the same, but I'll tell my tale anyway. > > There is a vacuum sensor on the left front fender that has a vacuum hose > going to the cruise control vacuum pump (located farther forward and > lower in the same area. The purpose of this sensor is to limit boost to > basic boost when the cruise control is engaged. If this is > defective/misadjusted, it will keep you from getting full boost. There is > a cap on top that allows access to an adjustment screw. > Yup... that's the "pop off" valve I mentioned above... -Justin

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