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Old 06-27-2003, 03:28 PM
BongC36 BongC36 is offline
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Join Date: Feb 2002
Location: Philippines
Posts: 111
M104 fluctuating idle speed

Gents, My 95 C36 suddenly developed a peculiar idle today. It fluctuates from 1000 to 1700 RPM in approx 1-second cycles, in gear or in neutral. This is scary because the car speeds up by itself when the RPM climbs and brakes can hardly hold it.

I shut the motor off but the problem was still there when I re-started. I shut it down once again and when I fired it up after a couple of seconds, the idle was now steady but very low (400-450 RPM). There are no check engine lights showing and everything else seems normal.

I did a search but can't find any posts with these particular symptoms. The plugs are about 1 year old (less than 15,000 km) and car is very smooth and powerful until today.

Assistance in troubleshooting this malady is highly appreciated.
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