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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 06-03-2016, 07:46 PM
mikepeiE30 mikepeiE30 is offline
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Join Date: Jun 2016
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Mein Auto:
High idle

Hey guys, so I know this question isn't uncommon, I have and 84 318i, and I have a high idle issue, about 3500 rpm constantly, I replaced multiple sensors, ex. Icv valve, throttle positioning valve, mass air flow sensor, coolant temp sensor.
checked for vac leaks and there's nothing.
What else could be causing the high idle?
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  #2  
Old 06-03-2016, 08:41 PM
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hornhospital hornhospital is offline
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Mein Auto: E24x2,E36x2,E30x1, F150
Maybe the IAC computer?
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Old 06-04-2016, 08:35 AM
markseven markseven is offline
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Mein Auto: bimmerless at the moment
Did you clean / test the idle control valve?

Is the throttle plate fully closing?

How did you verify no vacuum leaks? Does the idle change if you remove the oil filler cap?
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Old 06-04-2016, 05:46 PM
mikepeiE30 mikepeiE30 is offline
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Mein Auto:
Throttle plate is fully closing , checked all the lines for vac leaks , put on a brand new icv calve, there is power going to it aswell, and yes still high idles when you take off the oil filler cap
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  #5  
Old 06-06-2016, 04:34 AM
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BigBoy740il BigBoy740il is offline
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Mein Auto: 1989/1991 E30; 2000 E38
High idle

Is throttle cable too tight? The 318i m10 uses a fuel distributor and diesel style injectors. It uses engine vacuum to lift the internal fuel distributor plate, which Increases the fuel flow. Have you tried using a long allen key to adjust the fuel/air ratio plate? Restricting the amount of air coming into the will lower the rpm/ fuel released. Try it and let me know.
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Last edited by BigBoy740il; 06-06-2016 at 04:36 AM.
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