Quote:
Originally Posted by Diseasel300
The idle control valve is electronically controlled and must be energized to reduce the idle speed. If the control module is acting up or the OVP relay has failed, the default strategy is to leave the ICV open and default to a high idle.
Check out your control module for the ICV, you probably have broken solder joints, it's a very common issue. It will cause erratic operation and make you pull your hair out trying to nail it down!
The control circuit of the ICV is transistorized in nature, you must measure voltage with it connected to the ICV, you can't accurately measure the circuit voltage just by probing the plug. You can test the ICV itself by applying 12V directly to the terminals (make sure you have the plug disconnected). The engine RPM should noticeably reduce and possibly stall.
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Thanks Diseasel300 !
Well, that did it. Applied 12 volts directly to the ICV and the motor stalled out. So no issue with the ICV that I can tell. I am not sure how to measure voltage since it is all over the place or shows a very low value. I'll look into that more.
I am looking at the ICU which I thought was good but apparently not. Still not sure how to test the ICU. I understand there are some transistors that do go bad. I am going to check the three transistors on the board to see if they are bad and then replace them if so.
One step at a time...
