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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 11-27-2006, 12:29 PM   #1 (permalink)
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Wild Revving

In the past few days my engine has taken on a life all its own at times. Last night I was pulling in to my neighborhood and when I took the car out of gear it revved up to 3000 RPMs and stayed there even as I got back into gear, put it in neutral, put it in reverse, put it in first gear, and parked and popped the hood. I pushed the throttle lever forward thinking it might be caught and it dropped the RPMs. Today after driving a few miles, I was taking it out of gear after reaching 3000 RPMs and as I did so it jumps up to redline! It came back down though.

I lubed the accelerator cable and after reading the post under http://www.bimmerwerkz.com/forum/3-s...hlight=revving
I checked the connections near the air flow sensor and nothing seems loose. If the accelerator were sticking it would be one thing, but the engine is revving on its own (its unnerving).

This is a 1984 325e with a manual transmission (so no transmission accelerator cable).

In the past two months I've found out that the air flow mixture is lean and in the last month the idle speed has been rhythmically fluctuating between 1000 and 1200 RPMs. Could this all be a bad Motronic Control Unit?
I've work done and I've done work on it myself, I don't want to have to get a new car.
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Old 11-27-2006, 07:12 PM   #2 (permalink)
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Either you blew a fuse or your idle control motor is no good. But first check the coolant temp sensor.
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