Still dealing with this POS.
Ohhh yes, the high idle was solved leaving behind the infamous 'surging idle'

There has to be a very special group of German engineers who gather at least annually to laugh at those they left behind to deal with their incredibly bs style of so called engineering.

Some background.
http://www.peachparts.com/shopforum/tech-help/369277-89-300e-w124-m103-high-idle-solved.html

ALL injector boots replaced. ALL needed it. Been all over the drivers side of the motor with a spray looking for any other vacuum leaks which many of the injector boots had. No additional leaks found anywhere.

Additionally, the OVP relay replaced with a 2 fuse version as was the one I pulled. NO CHANGE.

Distributor cap and rotor were also replaced. Both were needed.

From another site one suggestion I just got thru trying was to replace the AIR FLOW POTENTIOMETER which did not solve the issue. Spec is supposed to be 0.7mvdc +- 0.1mvdc.

At operating temp, voltage ranges from 0.3 to 1.8mvdc. Rpm's range from ~500 to 1100rpm.

Is there anyone here that has solved this issue ? By solve I mean had a M103 with a surging idle that something was done that actually left the M103 with a stable idle.

I have to express that I am not looking for guesses...just resolution.
Thanks

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."