MWB 3 & 11 MKB ASZ: Evaluation/Review

Hello, please evaluate my log file. I deliberately chose the display, the gear selection (2 instead of 3 due to better resolution), and the driving phases because the problems occur there. All acceleration runs up to approximately 4200 RPM were performed in 3rd gear. There were four of them. The first two were with the A/C ON, and the other two were with the A/C OFF. The engine was warmed up. I am looking forward to your findings .

Here is the link to the Excel file: https://community.dieselschrauber.org/en/viewtopic.php?p=128940

See you, Thomas.

Who are "the" ... that is, "the" problems?

m;

Hi, I intentionally didn't mention it again here... I thought that without any background information, people are less likely to jump to incorrect conclusions about the diagnosis. That often happened with workshops. If you told them something for 10 minutes, they often got completely lost and didn't know where to start. They would just randomly replace parts. I think you can probably tell if all the values are within the normal range, right?

cu moby

moby wrote:

I'm looking forward to your insights

The AGR is "defective," and the LD control seems to be trending slightly upwards (is the VTG rod too short?) ... but what should we do now?

Hello, so the AGR valve has already been replaced. And what does 'VTG rod too short' mean? Or, to put it another way, can the problem be fixed without replacing the turbo? The turbo has also been replaced before, as have the mass airflow sensor (MAF) and the solenoid valve.

What should I do to be able to pinpoint the error more precisely? Should I log other relevant data? Should I also include the data from the '8er' (presumably a specific device or process)?


'@ulf I've already been to at least 6 workshops, and none of them were able to pinpoint the problem... Everyone recognized that something was wrong. That's why I asked about the values without mentioning the background, just to see what was amiss. I have a feeling that if you mention a few things, people get led down the wrong path and then start looking for the error elsewhere. I don't want to make it difficult for anyone to assess the situation, and I'm not enjoying just posting things here! See my other posts in this forum.'


cu moby

moby wrote:

Hello, so the AGR valve has already been replaced. And what does "VTG rod too short" mean, or, to put it another way, can the problem be fixed without replacing the turbo? The turbo has also been replaced before, as have the MAF sensor and the solenoid valve.

Perhaps there is a foreign object obstructing the flow in the pneumatic pressure connection?
Disconnect the hose from the N75's air intake and suck on the hose with your mouth. If it's clear, you can then test the non-return valve (refer to the factory service manual for instructions on testing pneumatic components). If that's also okay, the only remaining option is to rotate the VTG shaft further (rotate it one full turn to start).

Perhaps your MSG (Material Stiffness Gradient) data contains control parameters that promote oversteering. In that case, it wouldn't be a bug, but rather "state of the art." However, it can still be adjusted by changing the VTG (Variable Torque Geometry) rod length.

Quote:

@ulf I've been to at least 6 workshops, and none of them were able to locate the problem... they all recognized that something was wrong. That's why I asked, without them knowing the background, what was wrong with the values.

Besides the faulty EGR valve, I can't identify any other "problem."
Is that really what you're concerned about?
Then, simply check all the options available in the AGR-FA (German Agricultural Register) for deactivation, especially if you are not the original owner.