Date: Mon, 10 Nov 2003 17:22:35 +0000 From: Grunff <grunffnopsam.com> Subject: Re: 1987 16V Turbo idling problem
Terry F.Rock wrote: > I'd like to caution you guys about which screws are used to adjust idle.... > You can achieve the 850-900 rpm by either means, but the CORRECT method > after cleaning the plate (assuming you have changed the original setting), > is to first back off the 8mm nut and turn the slotted set screw out to allow > the throttle plate to completely close....then turn it back in until contact > just barely starts to move the plate. Go one quarter of a turn in, and > secure the 8mm locknut. This set screw not only sets the initial plate > clearance, but if you do not have the very small bypass gap (i.e the actual > plate NOT touching the bore of the housing), the plate will start to 'wear' > a groove into the bore over a period of time. Start the car and allow it to > idle, until the radiator fans cycle at least once....loosen the 10mm locknut > on the 10mm bolt protruding from the throttle housing. Adjust the screw in > or out to achieve the idle rpm, and lock the 10mm nut.You will only have to > do this one time EVER unless the vacuum somehow changes or engine wear > occurs. Over a period of time the idle will deteriorate....just clean plate > and idle will fall right back to where you set it this time...Good luck.Keep > 'Saabing'. All good advice, except that the 10mm air bleed screw was in fact not present on later models. In that case the only adjustment is using the throttle plate stop. Also worth adding is that the "correct" way of doing it involves connecting a dwell angle meter across the AIC, and adjusting the idle until you hit the correct dwell angle (can't remember what it is - 25deg?) -- Grunff
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