First, forgive me for starting yet another thread on this topic (high idle), as I'm doing everything i can to prevent taking to shop - while also learning about my car. Have spent weeks studying posts but not sure Im making any progress.

Just installed remfg Idle Control Unit and idle still varies from 800 - 1500 rpms. Seems to idle fine when first started, but rises when it reaches operating temp.
Checked voltage at Idle Control Valve (pulled back connector to reveal pins) and it's reading 0. HOWEVER, if I totally remove conector to ICV, idle surges. Since it surges, wouldnt this mean there is power to ICV? If I disconnect ICU, idle surges. Maybe wiring between ICU and ICV is shorted?
I've put 9v battery to ICV pins and can hear audible click.

I also disconnected oil temp sensor - no change. And vacuum lines seem ok.

I'm stumped again.

Ragtopper
1982 380SL