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Old 11-15-2012, 11:23 PM
tim96 tim96 is offline
Officially Welcomed to the 'Fest
Location: NZ
Join Date: Jul 2009
Posts: 253
Mein Auto: bmw e30 320i
I may be wrong but..
The screw on the afm is for air / fuel ratio at idle and should only be adjusted while monitoring air / fuel ratios

There is no idle adjustment screw on the throttle body, just a screw which controls closed position of the throttle (which sits just passed right angle to the throttle body).

The idle is controlled by the idle control valve. If you open your throttle slightly from closed you should hear the idle control switch 'click' and 'click' again when you release the throttle. That is how the car knows whether it should idle the engine.

It is not uncommon for people to adjust the screw on the throttle body thinking it is the idle screw, this is incorrect practice.
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