I am in the process of troubleshooting an issue with a 1995 E300 with 240k miles. The initial problem was after starting cold and driving for about 2 miles the throttle would almost seem to "stick". When it did it to me one time it was almost like the engine accelerated. You could take your foot off the gas pedal and it would cruise along at 2000 rpm. One thing I seem to have noticed is that I do not think this issue happens at all once the engine is up to temperature. Keep in mind too that it happens only every now and then. I cleaned and lubed the throttle linkage and it seems to be ok but this was only after driving for one day. I will see if it does it again tomorrow morning on the way to work.

I don't feel that the linkage sticking is the problem but I may be wrong. Anyway, I pulled the trusty home made code reader out on terminal 4 and initially got a code 2 (speed sensor), 3 (ELR temp sensor) and 8 (ELR actuator (Y22), ELR control loop "open circuit". I was able to clear out code 3 and 8 and they have not come back up but code 2 will not clear at all no matter how long I hold the pushbutton down. I checked the resistance through the speed sensor and got 605 ohms which is within spec for the Beru sensor. I even went so far as to swap it with an other speed sensor that was within spec for the brand and I am still getting code 2. I am getting a voltage change from the speed sensor as I rev the engine up and the idle does currently return to spec after revving. The engine wiring harness has been changed and is in good condition.

The manual says the issues that it could be are Plug connection (X26/7), (L3) clearance, dirt), Plug connection, starter ring gear speed sensor (L3x1) and finally wiring.

Now for the questions:
1. Has anyone ever run into this problem before?
2. Why won't the code clear?
3. Where is plug connection X26/7?

Any help or guidance in regards to this issue will be appreciated. Oh yea, I have a 95 E300 just like the one I am trying to resolve issues on sitting right next to it so it is pretty easy to try the different parts as I need to.

Thanks

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Jim