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E21, E30 General discussion and technical help for 1975-1991 3 series cars.

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Old 09-16-2009, 01:56 PM   #1
kaugarsa

Name: kaugarsa
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1987 325I high idle

Good afternoon all-as a new member of the forum and the proud new owner of a beautiful 1987 325I, I wanted to say hi and ask for some help.

When I start her up, or when sitting at a stopsign, the idle speed spikes and then stays at 2000 RPM. Based on what I have read in the forums, I cleaned out the ICV, checked for leaks and cracks, and still nothing....as I am a novice at this, would appreciate any and all help.
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Old 09-16-2009, 04:29 PM   #2
Big Evil
 
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How's the adjustment on the throttle cable? Occasionally they can get bound or the cable stays can pop out and get stuck. Do you have a check engine light or any error codes?
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Old 09-17-2009, 09:59 AM   #3
kaugarsa

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Throttle cable is good, no issues. No check engine light or error codes either. Short of taking her in to a dealer, I'm baffled.
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Old 09-17-2009, 03:44 PM   #4
Big Evil
 
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Cleaning out the icv is one thing, maybe the icv itself is bad, or has a wiring issue. Any other ideas out there?
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Old 09-17-2009, 05:03 PM   #5
3050rpm
 
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No other ideas, just similar experience... My car has done that on three or four occasions over the past few years, but it was only of short duration, at most a couple of days, sometimes for less than a day. About the only thing I can recall is that it seemed to occur with the onset of cooler weather, perhaps when I was only using the car for short hops and it didn't really get the chance to get up to normal operating temperature for a sustained period of time. For some non-rational reason I got the sense that it would correct itself, hence I didn't do anything to check the problem out, other than to take the car out on the highway for a while. Seemed to do the trick, but don't ask my why. Water vapor in the fuel system? Water vapor built up in the catalytic converter, thus screwing up the 02 sensor (I've had that happen too)?
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Old 10-15-2009, 11:53 AM   #6
Akuma

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Might be a faulty air flow meter, I'd get it checked.
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