Hi there,

I'm new to the forum.

I have a 1993 M-B 190E 2.3 (auto) that I have owned since new. It's been a brilliant car that has needed very little repair (outside of regular maintenance).

Two days ago I started experiencing a new issue.

When I stopped my car at the end of a ten minute drive and placed it into Park, the engine revved up to around 2500rpm. I thought that maybe the ECM might've been having a problem and needed resetting, so I went shopping and thought nothing of it.

Now in park and neutral it revs anywhere from 2500 - 3200 rpm, and in drive from 1000 - 1500 (causing some lurching at takeoff, and continued gas delivery when my foot's off the gas).

I replaced the throttle return spring last summer, and the throttle feel is still excellent, which leads me to believe that it is not a problem.

I've heard that this problem could be due to a problem with the throttle linkage, idle control valve or unit, or the microswitch engaged by the linkage.

Does anybody have any suggestions that could help me troubleshoot this issue?

I don't mind working 20 straight hours on the thing with my trusty Haynes guide, but I just bought an engagement ring, so I can't afford to take it to a shop for another couple of weeks!

Many, many thanks.

Russ