[benzbos]

This week I've reset the ECU with the following steps:
1. Turn the ignition key to the on (not start) position.
2. Press the gas pedal to the floor and hold for five seconds.
3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.
4. Wait at least two minutes for ECU to reset.

After the reset I've the following issue, when starting with a cold engine the RPM is unstable.
1. Pressing the gas pedal to speed up it hold back sometimes.
2. Stationary the RPM drops with an interval in every 10 seconds.
3. Constant driving 80km/h the RPM drops sometimes.

But when the engine is warm afther 20+ minutes the problems are gone.

 

[Plutoe]

I would recheck what you think you are doing or rethink what you want to do, because you don't reset the engine ECU with the fuel pedal.

The ECU can be re flashed to factory settings while in developer mode when using the MB DAS Xentry diagnostic software.

What are you trying to accomplish???

 

[Check Codes]

The procedure you followed resets the adaptive transmission shift points, nothing more. And since I don't think you have an adaptive transmission (beginning with the 722.6xx 5-speed in the 1997 MY), you didn't even accomplish that.

It seems more likely that you somehow managed to confuse something in the throttle position sensor with the pedal movement and the engine off.

Assuming you have the radio code and manual (so you know the steps to reset other items, not sure what features your car may have given age and market) I would try disconnecting the battery and stepping on the brake pedal for twenty seconds (dissipates stored charge), then reconnect the battery. If that doesn't help, you could start inspecting everything under the hood related to the intake, or take it to a proper shop to have it scanned and diagnosed.

Just as an aside, in the future if you don't know exactly what a procedure is supposed to do, and whether it's actually for your model and year, it's best to ask and be sure before charging ahead. (That holds true for everyone, not just owners of Dutch-market 1995 MB diesels.)

Good luck, I hope it is simple and inexpensive.

 

[fabbrisd1]

Need W124 forum search, but will try to be helpful

OP - as a '95 try the W124 section. Use the forum search feature and you will find there are several potential issues to explore.

You can also disconnect the plug from the idle speed solenoid on the back of the injection pump, the injection system runs mechanical only, if the cold idle problem disappears then you know its in the electrical portion of the injection control.

Since your basic cold symptom is 10 sec periodic, and unplugging the solenod eliminate the problem.

Minor fuel line/pipe leakage, or minor injector seal leakage can also be the problem.
Is your tach OK, or does it drop to zero sometimes, inciates another different issue
.
Regarding the later W210 series. Actually, the reset is often referred to the as a ECU reset and also referred to as a Tranny reset - actually the procedure resets ECU settings for both the tranny and throttle setting to default, and a bit more. .

Blutoe is you don't know the W210 key reset procedure - please add it to your database. The only reason I have used a default reflash is for a attempt to revoer a corrupted ECU like from a bad jump and the like. I have also reflashed to default after flashing upgrade/mod programs I decided I din't like. What have you reflashed for ?

 

[benzbos]

Thanks for the reply and usefull information.
I've read this topic How to Reset Your W210 ECU

I am a former W115/W123/W124 user and just love the Benz and doing all the maintenance myself, but I am new with al the electronical luggage of the W210. :surrender:

And I've ordered the MB Carsoft 7.4 Interface Multiplexed MCU Interface for Mercedes Benz unit to read the error codes from the board computer to recieve more electronical information.

 

[Plutoe]

I am very sorry, however I don't see what your key reset mutterings has to do with the case! However I will re read the post.

Regards to your below listed question, for which I have quoted rather than copy, my answer follows the question!

"Blutoe is you don't know the W210 key reset procedure - please add it to your database. The only reason I have used a default re flash is for a attempt to revoer a corrupted ECU like from a bad jump and the like. I have also re flashed to default after flashing upgrade/mod programs I decided I don't like.

What have you re flashed for ?"

On hookup DAS Xentry will tell me if an update is available for a specific car models control module, be it engine, transmission or body module. That is not re flashing, thats updating!

A re flash would be when we hook up and find that the dude has been to a "chip tuner". We will not work on any car that has been chip tuned and returned to factory settings. The only SAFE way to accomplish that is use "developer mode".

However WTF does this have to do with the OP post!!