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  #1  
Old 11-12-2000, 04:53 AM
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Join Date: May 1999
Location: Calgary, Alberta, Canada
Posts: 190
I have an 1988 300E that has been idling high a lot of the time. If the car is in neutral or park it idles at about 1500rpms, but when it is in gear it idles at about 750-800rpms. Sometimes the idle while fluctuate between 800-1500-800 and so on. Any idea what may cause this?

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Old 11-12-2000, 05:41 PM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
check overvoltage relay. had similar problem before, bought updated OVR with red top and 2 fuses.
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Old 11-12-2000, 07:28 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
There are many reasons that this could happen. One could be a faulty sensor or sensors. Others could be air leaks. If the problem persists, you should have it checked by a professional.

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