It has been over a decade now, but mine just needed to be lubed and adjusted so there was no longer a preload on the linkage.
Early U.S. 190D's (up to a few months into MY85 IIRC) apparently did raise the cold idle speed under a certain temp using a vacuum controlled system, but the later electric system is more to stabilize the idle (at least on mine it didn't appreciably raise the idle per the gauge when cold) and has no transmission input.
I still think you should start by lubing all the linkage ball joints and adjusting it per the FSM before going any further.
Quote:
Originally Posted by kahlil88
If your idle increased after it warmed up, I have to wonder if something was connected backwards.
My engine actually idles at 750 rpm right after I start it, but stays at 900-1k after touching the pedal. Another thought that crossed my mind is that maybe my ELR "thinks" the car is in park, since it originally came with an auto and now has a 5-speed manual. My old 1978 300D idled really rough when I stopped at a light while in drive, but was much smoother in park/neutral. No tachometer to verify the idle but I'm fairly sure it was a higher rpm in park.
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