Idle Control Problems? - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 08-18-2004, 03:04 PM
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Okay, i've been reading up on this stuff, and i've been hoping this problem is just due to my Idle Control Valve. My car's been acting gay on and off for a couple months. What it does, is when you come to a stop, sometimes it will start acting like it's going to stall, but then it catches itself, and revs back up. I've had it into the $tealership, only to have them charge me an arm and a leg, to say "We have no idea". I've had it into a couple other mechanics, too. They have no idea either, because they couldn't reproduce the symptoms. I've just figured out how to reproduce the symptoms. I basically turn everything on. Wipers, Lights, Heater, Blinkers, Radio. I sat there turning stuff on and off for a half hour, and as time goes by, it takes less and less stuff being on to reproduce the symptoms. It gets to where just having the wipers on will make it crap out.

I cleaned the ICV out with carb cleaner a couple days ago, but it's still doing the same thing. Maybe I should just replace it?

Thanks, Ian

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#2 (permalink) Old 08-18-2004, 03:24 PM
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see if turning the steering wheel to full lock and pressing the brakes makes it worse. I'm not exactly sure what kinda of power brakes you have (if they are vaccum operated or pump driven, I presume vaccum) now if your brakes are hydraulically boosted from your power steering pump, then what might be happening is when you brake you will put a little more strain on the engine, nothing you would notice under normal conditions, but because the throttle is closed, if the ICV is not working properly it will not adjust quick enough. You might also have a bad sensor somewhere, but if the problem is only when the rpms are falling back to idle and the car runs fine other than that, most likely your on the right track with the ICV

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#3 (permalink) Old 08-18-2004, 03:50 PM
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maybe u have bad ground since all the applications u have running ar eelectrical maybe ur alternator isnt working properly and u are loosing charge so check that out. gl
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#4 (permalink) Old 08-18-2004, 05:49 PM
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Sounds like an idea. How would I go about checking that out? Just throw a new one in?

Thanks, guys. I really appreciate the help.

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#5 (permalink) Old 08-18-2004, 11:03 PM
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its not the ICV, i know what it is. umm.... its the idle control module, looks like this.



www.bavauto.com has it for 174. i had the same symptoms with my car (325es) and i changed this and it runs like it used to. its located in the glove compartment, first you gotta take out the panel from inside. good luck on the fix. by the way, i got a used one for about $100 bucks from a wrecked car. hope this helps.

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#6 (permalink) Old 08-19-2004, 05:33 PM
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Where's the ICM located?

I have a similar problem but so far I've solved it by following vacuum lines to find a leak
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#7 (permalink) Old 08-19-2004, 07:57 PM
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"its located in the glove compartment" just remove the upper panel thats inside.

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#8 (permalink) Old 08-20-2004, 08:33 AM
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I had the same problem on my 325is. The other symptoms I had was that after the car was driven and hot I could not restart it and I would have to wait until it cools. With all this I replaced the fuel pump three times having all the broken pumps burn out. Somehow the wiring got messed up I guess but since I went to dealership and had them replace my pump I don't have any more problems. That is of course with me not listen to the radio any more 'cause now I am paranoid.

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#9 (permalink) Old 08-20-2004, 08:37 PM
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some1 said they had that same starting up problem, they said it was the injectors or something? i hope that helps :-/


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#10 (permalink) Old 08-22-2004, 06:00 PM
OMFG another one!?
 
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I'm sure a replacement ICM will do the trick, since in most, if not all, cases the ultimate control of idle is governed by the closed throttle idle by pass B)

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#11 (permalink) Old 08-30-2004, 10:06 PM
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what about an O2 sensor? that could cause confusion to the computer which could cause the engine to act like that
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#12 (permalink) Old 09-16-2004, 08:08 AM
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about the idle control module -- where the HELL is this thing?

you said its in the glove box, i dont see it, the only thing in there is the main conputer.

how big is it ? i spent all day at the junk yard ripping a poor e30 to shreads looking for this idle control module.

i replaced the idle control valve and my idle is still messed up.

is there i diagram for the vacume lines anywhere on the net?

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#13 (permalink) Old 09-17-2004, 04:14 PM
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remove your idle control valve and give it a good cleaning in the air passage area with a good quality penetrating oil. blow it clean with low pressure air .its possible the valve is just gummed up and the accuator is unable to phisically overcome the crud. that builds up.
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#14 (permalink) Old 09-17-2004, 05:32 PM
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shit son, ill post pics later on tonight.

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#15 (permalink) Old 09-20-2004, 06:20 AM
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ok im heading out to the junk yard here in a few you all say this idle controll is in the glovebox by the ECU , i coulnd find it last time but hopfully i can find it this time

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