Date: Wed, 12 Nov 2003 04:30:12 GMT
From: "Terry F.Rock" <>
Subject: Re: 1987 16V Turbo idling problem

Dwell 30 or duty cycle of 33......Grunff also gives great advise. "Grunff" <> wrote in message > 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 > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ( Version: 6.0.537 / Virus Database: 332 - Release Date: 11/6/2003

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