Idle speed
What is the normal idle speed for a M50 525i at operating temperature? My car will not idle below 1000rpms. If the car is moving at all, it idles ~1300-1400rpms. If i push in the clutch while rolling up to a stop, it idles around 1400rpms, if i am stopped and start to roll down a hill, it goes from 1000-1100rpms to ~1400rpms. Is this normal? How can it be adjusted?
1992 525i (Euro spec, 5-speed, cloth seats, manual windows, wheel covers...)
At home, in storage:
1994 Audi S4 (not so stock)
1983 Honda CB650SC
Major Contributor
Idle speed is software controlled. There's no adjustment for it. Since yours is wrong it's likely that you have a hardware failure or a bad connection somewhere in a sensor or actuator. Things high on the list are dirty MAF, the throttle position switch, or maybe a sticking idle control valve. You can clean the MAF with that new CRC MAF cleaner if you can find it, otherwise lots of people report success with electrical contact cleaner. You can test the TPS with an ohmmeter, but be aware that it can be temperature sensitive. The ICV is easy to remove and clean with carb cleaner or Goof-Off.
Last edited by SRR2; 03-28-2006 at 11:13 AM.
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