300TE-24V sometimes low idle, low voltage at ICV

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New Member
Dec 6, 2023
Jakarta, Indonesia
1991 Mercedes 300TE-24V
Hi all, I have a 1990 Mercedes 300TE-24V with the following symptoms: low idle when in gear and AC turned on (when turning on AC after the rpm goes a bit down, it does not go back up at all). 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, ICV, Jetronic module, but voltage stayed at 1.8v.

However when I try to start the car the following day, everything is normal and voltage is at 11v. This idle drop happens ocassionally, and so when it does I have to wait till the following day until it gets normal.

Any suggestions on where else to look?

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