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erratic idle speed '94 850 Turbo 850 1994

posted by  dwc on  Fri Nov 5 18:02 CST 2004
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last visit: Thu Jun 14 04:22 CST 2001
[RELATED]

Hi Group:

Our '94 850 Turbo has developed the following problems. Idle speed is sometimes erratic, and sometimes is as high as 3-4K rpm's. If I drop the car into neutral while driving, occasionally the engine speed just doesn't drop down to normal idle speed, and of course, this can be felt as the car doesn't slow down when the throttle is released. This is not a problem relating to either the throttle cable or butterly sticking, and while the idle speed is high, if the engine is turned off and then restarted, idle speed is reset to normal. This problem is highly intermittent, but also when the car is initially started, occcasionally the idle speed revs and drops several times before settling down to normal, instead of just that one normal increase and drop. There is also sometimes an initial stumble off idle speed when th ethrottle is quickly depressed, but again, that seems to be highly intermittent.

So, what sort of issue am I looking at here? Is there and idle solenoid or air bleed valve I should investigate? Several of the small vac hoses have been replaced over the years, and they all seem intact, but I haven't yet checked the large air hoses connected the AFM and throttle body.

Thanks for any advice you may be able to offer.

Regards,

Dean






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