Every time I switch off my ignition the control relay next to the ECU starts to buzz and keeps buzzing until I switch on the ignition again. Ultra Tune fitted a new idle speed control motor last week and if I unplug the electrical connector to this the buzzing stops. (the buzzing was there even before they fitted the ISC motor) This is driving me crazy . . pulling the plug every time I stop the car. :rant: Any ideas ??

It could just be a dud relay; try replacing it with one from a non essential system.

Already took the relay out and checked it to the service manual and it was fine. I'm thinking it somehow has more to do with the idle speed motor and the fast idle air valve set up. The engine never fast idles even when cold. . . always starts on 750 rpm and stays on 750 rpm even when engine is hot. Ultra Tune said a fast idle air valve was about $500 - $600.
Thanks for the reply.