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New engine code after reconnecting the DME last night. Code 1222, another idle control contact break.
Decided to test the ICV voltage based on the preocedure mentioned earlier. Disconnected the connector to the ICV and started the car. 13.4V at pin 2. Started the car, trying to keep the revs at about 700RPM. It kept stalling as the revs dropped. The last time I took my foot off the pedal, Voila, idle!!! While in idle (ugly at first but eventually stable at about 600RPM) pin 1 showed an odd looking repeating square wave (high for about 90% of the duty cycle and then a quick dip low). Duty cycle time was approx 5ms (i.e. abut 200Hz). Mind you, we were using an oscilliscope circa WW2 so the readings could be suspect.
Reconnected the connector and the car stalled immediately.
Went to friend's house who has a VW Corrado. While in idle, removed the VW's ICV connector and connected to my ICV. Snapped shut and didn't open. Disconnected mine and connected a third (known good) ICV. It hesitated for a moment and then slowly closed. Note that the VW ICV couldn't be tested in the 964 due to a 90deg bend in the VW valve inlet.
Based on this, I'm ready to spring for a new ICV. Any last comments before I pull the trigger?
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