950 rpm is not good idle. It should be around 650. It is likely that your linkage is crusty, and not activating the idle switch. Do some tests first before you start swapping parts.

Take the air cleaner off and manually push the throttle linkage back to the rest position. Look to the idle switch (grey roller switch) and see it engaged.

__________________
Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

Good thought. I already replaced the micro switch and the throttle cable is adjusted properly. The micro switch clicks open the second the throttle cable is engaged.

I have a fellow 16v guy lending me a Cold start valve, coolant temp sensor and fuel pressure regulator to test on Thursday. Side note: I swapped the Cold start valve from my Testarossa today.....no change but it is a different part number. In fact the part number installed on the 16V is different from the MB part site.


IIRC 950 idle is target for the Cosworth with manual tranny.

Ill update later. I love and hate this car at the same time hahaha. Not giving up on it though.