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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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Old 11-13-2009, 07:08 PM   #1 (permalink)
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high idle w/ AC on?

1991 325ic. Idles up to 2000 rpm with AC on. Normal idle with AC off. Cant find it in Bentleys. Any ideas? Saw something about an "AC on signal" in idle speed troubleshooting, but cant find any other info on it. Help?
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Old 11-14-2009, 01:39 AM   #2 (permalink)
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when you have the AC on, it will increase RPMS to match necesarry output, but going from standard idle to 2k is a bit much. have you run the codes on it yet? i know on my e30 when AC kicks on it will jump about 200-300RPM...and that fucker will frost my nuts.
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