The plug on the top of the IP is the rack position sensor, nothing to do with 
idle. It has a locking ring that needs to be turned to allow removal.

There is a small two pin connector at the back of the IP, between IP and cruise 
control actuator, which is for idle.  Pinch to release.
Max Dillon
Charleston SC
'87 300TD
'95 E300

On July 13, 2015 12:00:18 AM EDT, Curly McLain via Mercedes 
<> wrote:
>(I think EDC is the book term for the 
>electronic idle speed control plug on the top of the IP.)  


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