M104 Cruise Control misbehaving - PeachParts Mercedes-Benz Forum

LarsL · #1 08-09-2006, 05:18 AM

All,

Having followed Arthurs advice in a previous thread, I cleaned up the area of the engine thoroughly, re-regreased the components of the throttle linkage, checked throttle cable play, did the measurements and adjusted everything according to article in WIS. --> CC still jerky. Cleared code 11 from CC/IC, and will see if it's reappearing.. Will post status today.

Tires are evenly worn (fairly new ones 225/45/17), and tire pressure is OK.

BTW, the speedometer needle is shaking now and then. I had ruled that source out, as the CC is working consistently well in speed range 40-80km/h, and is consistently jerking above 80km/h, regardless of speedo shake or not.

Ignition wiring and looks good to me. Changed plugs couple of months ago. Don't know the status of last fuel filter change or Oxygen sensor, but there are no DTC's to be read indicating problems with those components.

skiier3_9 · #2 08-09-2006, 08:48 AM

If your speedometer is shaking - I would replace the speedometer cable, its not too expensive. I had a "jerky" cruise in our w201 and replacing the speedometer cable (after noting the bouncy needle) fixed the problem.

LarsL · #3 08-09-2006, 01:30 PM

Thanks for sharing that tip, but I'm curious; The speedo shakes only sometimes, but the CC is jerky all the time - I don't understand why..

I'll change the speedo cable as you suggest, 'coz it's annoying that shaking regardless of the CC malfunction.

Anyone have technical explanation on this?

Anyhow, code 11 is gone from pin 14 (CC/IC) (at least for now) after recalibrating and lubing the linkages, etc.. Will monitor for a few days and see if it returns.

skiier3_9 · #4 08-09-2006, 06:15 PM

Changing the speedo cable isn't too tricky - for the w201 it was as follows:

1. disconnect speedo at cluster and under the drivers carpet
2. disconnect speeod at tranny (remove the retaining screw all the way)
3. pull the speedo cable out of the car (in the w201 you have to go through the firewall, on the 124 it is under the drivers carpeting)