Engine warm = Fast idle, what's at fault here?

[epfozzie]

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]

you test the coolant temp sensors?

[shogun]

check this
http://paulaxford.com/bmw730i/afm_service.htm
http://paulaxford.com/bmw730i/checking_sensors.htm

[Jon K]

temp sensors and then idle valve