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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 10-07-2010, 07:29 PM
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LeVandaman LeVandaman is offline
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Location: Texas
 
Join Date: Aug 2009
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Mein Auto: '90 325ic, '03 330i ZHP
Stumped

Problem: the idle will randomly start to climb. It normally sits at 1k but will slowly climb. It usually will end up at 1.5k but has gotten as high as 2k. It doesn't do every time I drive her but like every 3rd or 4th time (not consistently).

What I have done so far: cleaned the throttle (the contraption on top of the throttle body), ICV and the throttle body anddrained radiator and refilled with antifreeze/water.

My next guess is O2 sensor based on research but I just wanted to ask you guys to see what y'all have to say,
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  #2  
Old 10-07-2010, 08:56 PM
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downhiller downhiller is offline
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Mein Auto: 2012 hypermotard 796
i would disconnect the o2 and see what it does then, and if nothin changes, try fiddling with the tps
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  #3  
Old 10-08-2010, 12:56 AM
Billwill Billwill is offline
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Mein Auto: BMW E30 318i 1991
Does the 325ic have a micro switch on the throttle to sense when the throttle is at idle or fully depressed?
I know the 318i has a micro switch...when the throttle is relaxed you can just hear the faint click of the switch which tells the ECU that the engine is at idle.
If someone has tried to adjust the idle by screwing in the screw (with locking nut) or if the throttle cable is too tight...the switch will not make and the car idles erratically.
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Old 10-08-2010, 07:23 AM
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LeVandaman LeVandaman is offline
Living life at 105
Location: Texas
 
Join Date: Aug 2009
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Mein Auto: '90 325ic, '03 330i ZHP
Thanks for the replies.

I will try taking the O2 sensor out and see what happens but what should I look for?

And I will research that micro switch further.

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  #5  
Old 10-08-2010, 09:36 AM
1991318i 1991318i is offline
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Location: US
 
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Mein Auto: BMW E30 0011-0001-1000
vacuum? mine did something like that, vacuum hoses fixed it
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Old 10-08-2010, 10:49 AM
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LeVandaman LeVandaman is offline
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Location: Texas
 
Join Date: Aug 2009
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Mein Auto: '90 325ic, '03 330i ZHP
Yeah that could be, the previous owner let it sit up in his garage all the time so most of the rubber hoses and various rubber or plastic components are not in the best of shape. Replacing all of that is on my to-do list but is going to move up if the O2 sensor isn't the problem.
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