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Date: 11 Nov 1998 13:21:42 GMT
From: jcauseynopsamfo.ucs.indiana.edu (James F. Causey)
Subject: Idle/APC tuneup on 84 900T


I have an 84 900 Turbo recently purchased with 160K miles... thanks to everyone who gave fluid info in response to my recent questions. Now, I believe it's time the old Saab had a tune-up. The idle is rather rough at all times, and a bit low -- when the car is started (especially when it's cold), I have to *gently* (so as not to rev the engine too much) give the car throttle to keep the idle up so it doesn't die. And if I get going while the engine is still cold, it'll die at the first stop light/stop sign and need to be restarted. I've also noticed that the turbo/APC gauge stays in the first, large white band most of the time -- when under load (accelerating), it'll live in the neutral band, or crank up into the boost when accelerating more rapidly or going up a hill in fourth/fifth gear or something, but otherwise it's in the first white. I didn't think anything of it, until I read on a web page recently someone mentioning that this meant the APC unit needed adjustment. Thus, I'm curious what tune-up steps I should try from here. I know the car can use a new distributor cap and rotor, and I'm going to change the plugs and wires, air filter and fuel filter too... any other suggestions? If I'm going to try to adjust the APC unit myself, do I need any special equipment? Thanks! J.

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