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Old 04-22-2002, 09:59 PM   #1
binarysys
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Question Please help, '84 318i 'surge' problem

Hi all...I hope someone can help. I love my BMW and need to know what I can do for it.

When I start the car (I live in SoCal) most of the time it revs up to 3000rmps and stays there. Every once in a while it will drop back down to 1500rmps but thats not very often anymore. We have tried to adjust the idle, no luck. It is a 5 speed, and when I am in 2nd, I dont have to press the gas cause of this.

Any clue as to where I might begin to search out this problem?

Thanks!
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Old 04-29-2002, 11:26 PM   #2
PaulB
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Hi iregular idle

Check the "Idle Control Valve". If the power is interrupted to the valve, it goes open and the idle increases. If you put a current meter in series I believe that the normal current when hot is 0.48 amps. There are several posting on the Inet about this. Try the BMW E30 Network

Paul In Boston
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Old 04-30-2002, 10:54 AM   #3
binarysys
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:flash:

Thank you for your reply. I did more research after I posted this message and found out that it was probably an ICU and ICV problem, and WOW...it was!

I picked up an upgraded ICU (green stripe, had the original black one in the car) and ICV from a junkyard here in town and put them in. It worked!!!!!!!!!!!!! Paid a total of $35 instead of $250....I am very happy with that!
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Old 04-30-2002, 10:11 PM   #4
PaulB
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Glad it worked out for U.
Actually mine is acting up in the 318i and that's why I just happen to know a little about them. When I stop it occasionally adjust the idle from 800 to 1600 and back again and repeat over and over until I tap the throttle.
I have a good ICV and throttle pos sensor. The ICU has had the green strip recall performed, but now I think it is acting up. I'd take it apart and trouble shoot the components ( I finally managed to get the cruise control working again by replacing the pair of output transistors - shorted), but I don't have another unit to sub in for the daily drive. I'LL HAVE TO TRY THE JUNK YARDS around Boston and take my chances. Perhaps I should buy your old one for messing with.
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