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View Full Version : Engine warm = Fast idle, what's at fault here?



epfozzie
03-19-2007, 02:53 PM
I know idle issues have been covered ad nauseum and I've done a bunch of searching, so sorry to bring this up! Now that it's been getting a bit warmer in Cleveland, I noticed that my car idles at ~1000 rpm when it gets warmed up. I used the Bentley and the results were:

-TPS voltages check ok
-AFM resistance changes when the "flap" is moved (but not linearly, it kind of jumps around)
-ICV hums when on and 1-3 pin resistance measures ~ 4 ohms high.

I cleaned the ICV to ensure that it's not sticking and the engine idles perfectly when cold. So what are everyone's thoughts?

Oh, 1992 535 manual

BillionPa
03-19-2007, 10:23 PM
you test the coolant temp sensors?

shogun
03-19-2007, 10:39 PM
check this
http://paulaxford.com/bmw730i/afm_service.htm
http://paulaxford.com/bmw730i/checking_sensors.htm

Jon K
03-19-2007, 11:40 PM
temp sensors and then idle valve