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Oscillating idle on cold starts (86 900T)
Posted by Dinger [Email] (more from Dinger) on Thu, 12 Oct 2000 14:46:31
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I have just purchased my first Saab. A 1986 900 Turbo that runs wonderfully except for the first 90 - 120 seconds on a cold start. During those first minutes the idle will oscillate between 1500 and 300 RPM. I have to feather in the gas to keep it from stalling at the bottom of the wave. As the engine warms up the amplitude of the variation slowly decreases, first to 1400-400 and then 1300-500 and so on, until after a few minutes it idles perfectly even. For the rest of the day as long as the engine is warm it will idle correctly right from the start. Also every once in a great while it will hesitate just enough to notice on hard excelleration.
After 10 years of RWD, carborated V8 GM monsters I am a bit out of my depth on this one. Thanks for any pointers.
Chad
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