Date: Tue, 2 Sep 2003 21:50:13 +0100
From: "Mike P" <>
Subject: Re: Saab 900 Turbo 8 - what's broken?

"Grunff" <> wrote in message news:bj032e$d6qer$ > Mike P wrote: > > > I've got a 1988 T-8, 202K miles. It's running OK, but I only seem to be > > getting low boost level - maybe about 1/3 into the orange. It's also been > > hesitating on pickup. The last couple of days it's also been hard to start > > when cold. Warm up reg has been replaced recently. > > > > Spoke to BPV in Slough, they suggested the misfire could be the plug leads > > because non-saab ones can interfere with the APC - possible or no? Also > > suggested I try disconnecting the pipe from the APC controller to the > > Wastegate actuator. I did this, now I get boost right up to the red as I > > think I should, and the misfire has vanished, apart from when the car is > > cold. > > > > So, is my APC solenoid knackered. Again? What else could it be? I haven't > > replaced the vacuum hose yet, but ordered some today. > > > Could be your APC solenoid is faulty, or it could be that the > APC is detecting knock and legitimately cutting back the boost. > > Easiest way to check is to borrow a spare APC solenoid and > install it. If it fixes the problem, the bingo. If not, you have > another problem. > > The other problem falls into two categories: > > [a] you really are getting knock, which is being correctly detected, > > or > > [b] you aren't getting knock, which means either the knock > sensor is faulty, or the leads are interfering with the APC. > > If [b], then it's easy. If [a], then you have some fault finding > to do. Replace plugs, leads, check timing, etc. etc. > Thanks for the info. I'll check it out at the weekend. rgds Mike P

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