[W126 Coupe] Slightly high Idle- What next?

[JohnJayKimrey1 at aol.com]

Hello everyone:
I know most of you have heard enough on this subject but I am not sure what  
to do next and any and all advice and information I can get is  appreciated .I 
have an idle of 850 rpm in park or drive with or  without a/c. It is smooth 
and doesn't change after initial warm up. I have  checked for vacuum leaks and 
found none. Air metering plate moves freely and  closes without a problem. OVP 
relay is new(previously sticking and ABS light  was on and rpm 1100).No 
binding of throttle linkage and throttle valve  closes freely. Throttle valve 
switch checked good for both open and closed  position with ohm meter, Idle control 
valve(ICV) appears to be operating but  cannot tell if it is closing 
completely. When disconnected idle goes to about  1800 rpm and connected to 850 rpm. 
Resistance is 4.5 ohms and voltage across  connector is about 5 volts+-.2 volts 
when connected and at idle.The valve  is moving freely inside as I removed 
and checked it. Thermo time switch and cold  start injector are working as idle 
dropped to 850 from 1100 after  about 30  seconds of start up but not to 
550-650.Is there anything I may have missed  and does my problem now direct me 
toward buying an expensive idle  control valve and or idle control unit. I don't 
have access to either units  to swap and no MB mechanic in town. Any advice is 
appreciated. Oh yes, my  vehicle is a 89 SEC with 80K miles and records show 
scheduled servicing. I  bought the car in May 2007. It had the high idle 
problem when  purchased.
Regards,
John K.



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