Please help, '84 318i 'surge' problem
binarysys
04-22-2002, 09:59 PM
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!
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!
PaulB
04-29-2002, 11:26 PM
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
Paul In Boston
binarysys
04-30-2002, 10:54 AM
: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!
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!
PaulB
04-30-2002, 10:11 PM
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.
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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