Date: Fri, 10 Oct 2003 17:36:15 +0100
From: "SAABurger" <>
Subject: Re: Saab 9000 rough idling when hot

Dave, Sounds like the Idle Air Control (IAC) valve to me. This is a small electro-mechanical device which fine-tunes the amount of air allowed to bypass the throttle, and forms part of a servo-system that controls the engine at idle. There is also a course, manual adjuster which should be set to ensure that the IAC operates within its operating range under all conditions. It sounds like your IAC is trying (unsuccessfully) to operate outside its operating range when the engine is warm, and therefore a course adjustment needs to be made. Adjustment should involve no more than a screwdriver and an automotive multimeter (with a "%Duty" position). If you are into gadgets then the Draper Expert DMM14 is worth considering at about 45 GBP (see e.g. Sorry I can only explain in general terms as I've never had to tinker with the SAAB's idle. In this area, I know a lot more about my Suzuki Cappuccino. The same principles apply though the designs differ. No doubt someone can advise more precisely of the procedure for the SAAB. IACs are also notorious for becoming sticky. Injector cleaner squirted directly into the air intake (in accordance with manufacturer's instructions) is the standard first approach, and much cheaper than sourcing a new IAC valve. Could be worth a try. Adrian "Dave" <> wrote in message news:blud0v$2cp$ > Hi All > I have a 1990 Saab 9000 that I have problems with! > When the car is hot (after 3 or 4 miles or more) the car will not idle and > not pull away. It will only do it when the car is hot. ie when the cooling > fan starts cutting in and out . > If you have been driving a while then get stuck in traffic, when you go to > pull away and press the throttle down, the revs just die and the car will > not move.The engine does not cut out , but takes a while to get going again. > I have replaced the HT leads and distributor cap and had to replace the fuel > pump prior to this problem. Does any one have any ideas as to where to start > on this problem ? > __________________________________________________________________ Dave > Bowen ICQ#: 59295208 Current ICQ status: + More ways to contact me > __________________________________________________________________ > >

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