Hey everyone,

I have spent the past three days reading all 90+ posts re. "300E idle" and have still not been able to diagnose the problem...

My 86 300E w/ 135K miles idles at 1450 rpm in park. When in D or R it drops slightly to about 1000 rpm. Also when a/c is switched on it drops to about 900rpm. I have lubricated and checked the throttle linkage, it is fine. I have removed the idle control valve and cleaned thoroughly. I have also disconnected the wires going to the ICV and throttle valve switch- no change in idle. The TVS is getting 12v from the wires and I do hear the "click" when the throttle is adjusted down. When i pull back the plug on the ICV and measure (with the plug still partially connected) it reads about 4v. It seems like no matter what I do the idle will not drop below 1450 in P or N. FYI, the oxygen sensor and OVP have both been replaced in the past two weeks.

Through reading all the threads re. high idle on the 124 it seems like there are lots of little things that vary on the different year engines in these cars that could control idle... At this point I am trying to decide if I should just buy a new ICV and try that or if the symptoms thus far should point me in a different direction..? Am I missing something here on ways to test the components that control idle?

Thank you very much!

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05 E55
03 E500