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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 05-07-2003, 09:16 AM   #1 (permalink)
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Hi,
Need help. I have a 1988 bmw 325 ic and the car idles when warm from 750 rpm to 3500 rpm. The timing belt was replaced, fuel injectors are new, and the air flow sensor has tested ok.

Any suggestions?

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Old 05-08-2003, 08:50 AM   #2 (permalink)
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Yea, its the ICV or idle control Valve. Spray some WD40 up in there and that should solve the problem if not just temporarily. ill get pics of where it is if you cant find it
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Old 05-10-2003, 12:36 AM   #3 (permalink)
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Where is the ICV located? I've had a similar issue, but not as drastic. Idle jumps around from 750 to 1000 or so. The new exhuast I just got added helped a bit, but I'd still like it to be smoother. Pics would really help a lot, Fox. Thanks
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Old 06-12-2003, 05:46 AM   #4 (permalink)
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check the FAQ forum. there is a general FAQ on this issue.
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Old 09-25-2003, 06:59 PM   #5 (permalink)
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I have had ideling trouble on my e30 325i touring. That was a small split in the air intake hose from the air cleaner to the idle control valve
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Old 09-26-2003, 08:42 PM   #6 (permalink)
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Where is the ICV located? I've had a similar issue, but not as drastic. Idle jumps around from 750 to 1000 or so. The new exhuast I just got added helped a bit, but I'd still like it to be smoother. Pics would really help a lot, Fox. Thanks
i have the same problem
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Old 09-28-2003, 02:43 PM   #7 (permalink)
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On my 325i the idle control valve is located on a pipe comming off the air intake. If you follow the air intake pipe from the air filter box, you will find a small pipe comminig off before you get to the throttle body. The small pipe goes into a metal 'tube', and then I think the pipe out of the other end goes back into the main engine air-intake bu the other side of the throttle neck. You will see an electrical conector atatched to the side of it as well. My car is a UK spec 325, not sure if that makes a diffrence.

I have been told you can clean them up with brake cleaning fluid. I just got a new one from the scrap yard, then found it was the a split in the airintake pipe.

When the engine is running the idle speed should increase if you remove the electrical contacts, and the resistance should be 9 - 10 ohms at about 73 degrees F, (23 degrees C)

Hope that helps

Kind regards
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Old 09-28-2003, 03:20 PM   #8 (permalink)
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I know some 318 (i think late 1985 models) have an idle stabalization relay. Thats also worth a look as I have had a couple of engine management problems that have always been traced back to certain relays.
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Old 09-29-2003, 01:25 AM   #9 (permalink)
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i have the same problem the car goes revin itself and idles... what happen to my is the air filter boot or hose .. i got a new one and it works pretti good not but best is to change the air filter too... thats my opinion im not shure but try it out esp to the ppl wit the cut on teh air filter hose. 1986 bmw 325e
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Old 10-03-2003, 09:27 PM   #10 (permalink)
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I have the same problem with my 87 325i... I also heard that there is another sensor/switch that goes hand and hand with the ICV. It is located underneath the dash somewhere.... Does anyone know anything about this? I heard it from a very reputable source. Who knows...
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Old 10-24-2003, 11:07 AM   #11 (permalink)
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I also have the same problem on my '91 318is. However, it is not a constant thing. It happens if I do a cold start SOMETIMES. I do alot of driving in a day (usually 60 miles) and it happens sometimes when I come to a stop after being on the highways for 30 minutes. That leads me to believe that it is something else besides a crack somewhere. Is this incorrect?
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