1985-1998 [Subscribe to Daily Digest] |
Don't let us make you nuts with esoteric theories of mystery parts. I, for one, am a true believer that Saab does all kinds of undocumented things with parts. So, BillJ's theory that these valves have mysterious hidden qualities is right up my conspiracy theory alley. I am not as sold as BillJ on the idea that there has to be some method to the madness. And there is the possibility that what BillJ experienced was just the natural random variation among individual valves.
BUT, don't get distracted by these subtleties. Start with the obvious. When I was having a boost problem, I convinced myself that it was not the APC/BPC valve because I got the right resitance reading across the terminals, and it was buzzing, and I was getting more than base boost in varying amounts and forty-nine other reasons I can't remember now. Bob Davis kept insisting that I try another valve. Finally, his nagging got the better of me and I broke down and got another valve from a distant junkyard (I was so sure that my valve was fine that I was not willing to invest in a new one, and instead drove 1.5 hours round trip to get a used one). Anyway, guess what, Bob was right. The junkyard valve restored my boost for $40 and 5 minutes of my labor. It took me an hour to get to the junkyard and 30 minutes to get back. The lesson, I think, is to start with the thing that has fixed the problem for other people.
I would also remind you that with any attempted change, you need to do a boost adaption run. Before doing this, you need to turn off the car and pull fuse 23 for more than 10 seconds. Then you peel back the rubber on the throttle position sensor electrical connector (with it still connected) and jump pins 2 and 3 at the rear of the connector. Then go out on the open road and hammer the throttle for more than 3 seconds, let off and then do it again and again. These instructions are from the Saab DI/APC manual and are slightly different than the instructions on the Townsend site. Note also that you may need to start and run your car several times to get it idling correctly after.
I would also recommend the DI/APC manual to you. I got the part number off Quasi's site and got the book from a dealer for around $20.
posted by 24.50.56...
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