Throttle return with AC on - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 09-11-2010, 09:13 AM
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Throttle return with AC on

I have an 89 325i. I find the throttle doesn't return at times when the AC is on. When I go to shift the rpms stay at 2500 rpm, if I turn off the ac the idle returns to normal and the throttle behaves. Any ideas what is going on?:
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#2 (permalink) Old 09-11-2010, 10:24 AM
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Is the idle high when the AC is on? Is so there is probably a mechanism that bumps the idle level when the AC is on to stop the engine from stalling at idle. As a guess I'd say that setting is too high, or at least causing something to stick.


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#3 (permalink) Old 09-11-2010, 12:42 PM
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Checked if something mechanical was rubbing and nothing there. The rpm diffed up to about 2000 without touching the gas.
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#4 (permalink) Old 09-11-2010, 05:33 PM
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check the ICV, if it is sticking or has an overactive sense of purpose, you will get idle and return to idle issues
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