A little misconception regarding function of idle control valve.

Whenever a cold engine is started it requires a rich mixture and a little more than normal throttle opening to keep running.

On carb cars, there was the choke blade and the fast idle cam.

On FI cars, there's the extra injector or a computer program to create rich running and there's the idle control valve to bypass a little more air, i.e. creating same effect as a fast idle cam but not actually opening the normal throttle blade. These are both controlled/monitored by an engine temperature sensor input to computer.

Not much action from idle control valve once engine's warmed up, except that it's supposed to be closed. It indeed "controls idle" during engine warmup, but after that it doesn't do anything.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles