Hi all, I have a 1990 Mercedes 300TE-24V with the following symptoms: low idle when in gear and AC turned on (idle does not raise back up when AC is turned on). I tried measuring voltage at the Idle Control Valve (ICV) and its showing around 1.8v. I tried a M103 car and it measured 11-12v. I have tried switching over the OVP and Jetronic module, but voltage stayed at 1.8v.

Any suggestions on where else to look?


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