Any way to check the OVP relay, other than looking at the fuse?
Measure the voltage coming off of it?
So the wires are fed power by the OVP relay?
The computer that monitors and regulates idle speed is powered by the OVP. The computer (idle speed 'relay') powers the valve.
So if I could figure out which one is supposed to be hot, then jump +12v to it, then the idle slows down,
Usually if you power the idle actuator separately the engine dies. It needs _some_ air at idle! Don't try to push power in while the relay is connected. Unless you maybe want to fry it. Killing the engine with the actuator is one way to test its ability to cork off all the way.
gets a heat signal from somewhere to close the circuit....
Not that simple. There's a microcontroller in there. It eats the tach signal and the idle throttle switch, and modulates the PWM duty cycle to the idle actuator to keep the idle RPM in spec. -- Jim _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
