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Old 06-11-2009, 01:18 PM
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Join Date: Jun 2008
Location: Chesapeake, VA
Posts: 138
No power to Idle Control Valve

While having the muffler replaced on my 1991 300E, I mentioned to the mechanic that the car idles rough when at a stop with the car in gear and the AC on. If I turn off the AC it smoothes right out. No problem with acceleration or while cruising. He tested the ICV and said that there is no power going to it and that it may be a wire, harness, or pod issue and that it may cost from $100 to $1000 to diagnose and fix.

Does this sound right? Anything I can check before I sink $$ into it?

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Old 06-11-2009, 01:54 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
On that car...........the idle control valve is controlled by the CIS-E computer.

Not a 12V circuit.

You need a meter with duty cycle function to measure control circuit.
You can't disconnect to test! the connector must be slid back but not disconnected.
At that time you start car & measure duty cycle between the 2 pins, MUST be careful NOT to touch them together!!
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Old 06-11-2009, 03:16 PM
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Location: Grand Rapids, MI
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Yeah, the ICV circuit turns off if you disconnect it, so that would be why there is no voltage on it. I found this out too when messing with mine. Must be tested with it still connected.
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Old 06-12-2009, 12:33 PM
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Join Date: Jun 2008
Location: Chesapeake, VA
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Would swapping out the CIS-E computer solve the idle problem?
I can get one at a junk yard for my car for $30.
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