Date: Mon, 03 Mar 2003 15:14:18 GMT From: "Fred W." <Fred.Willsnospamammyrealbox.com> Subject: Re: weird apc
"Simon Putz" <simon.putznospamline.de> wrote in message news:b3nuu6$uoo$00$1nospam.t-online.com... > Hi, > > i read some stuff on the saabmaster page and i noticed that there is no > difference in boost between cruise control set on or off > the boost gauge spikes to around 3/4 of the yellow and then cuts back to > 2/3, if i disconnect the APC system (fuse or the solenoid connector) > i get a little less than 2/3 on the gauge. i remember that when i got the > car boost went up much more even a bit into the red sometimes. > i dont have an idea what might be shot, but i will check out the knock > sensor, vacuum lines and wiring now, maybe something is just loose or so. > if i disconnect all the hoses from the solenoid i get mad uncontrolled boost > tho, does that mean my wastegate is working properly? > OK - you've already checked most of the system out. By getting high boost with the hoses disconnected that tells you the wastegate will close and the turbo will generate high enough boost pressure. This means your problem is an APC solenoid control problem. The APC solenoid should be controlled by the APC computer with pulsed 12V proportional to the amount of pressure reduction required. The things that will tell the APC to reduce pressure are the vacuum switch for cruise control on non-TCS cars (cruise control engaged switches to base boost), the brake light switch (depressing brakes switches to base boost) and the knock sensor (detecting knock reduces to base boost). If none of those are faulty the APC computer is bad. By the way, I'm working on the exact same scenario on a trionic car ('93 w/TCS) which is how I knew this stuff.
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