Audi A6: Gear Shifting Jerk - Troubleshooting

Hello!

Kürzlich bin ich im A6 2,5 TDI(150Ps) Quattro Avant (80000Km) meines Bruders mit gefahren und dachte erst, daß er mit der Kupplung etwas grob um ginge, jedoch hat sich dies als Irrtum heraus gestellt. Jedesmal wenn man beim Hochschalten auf die Kupplung tritt, ruckelt das ganze Auto über die Längsachse zwei Mal kurz nach, so als würde sich der ganze Antriebsstrang verspannen und erst beim Auskuppeln wieder entspannen. Könnte es sein, daß eventuell ein Gummilager der Getriebe bzw. Antriebsaufhängung diesen Fehler auslöst?? Eventuell hat was Spiel? Es sind aber keine Geräusche hörbar. Was isWhat's going on?

Hello there, Peter.

I've now taken it for a proper test drive. It's almost impossible to shift smoothly, even with plenty of time and care. The jerking is really annoying; if you're sitting in the back, it makes you feel sick. What's wrong with this vehicle? Also, nothing can be found during a visual inspection???

Regards, Peter.

Hello Peter,

Does the engine control unit receive the speed signal?
Simply check the measurement data blocks and verify their plausibility.
Without a speed signal, the shock absorption function of the MSTG is not active.

Best regards, Rainer.

Hello Rainer!

I never would have thought of that, thank you. Does it matter which set of data with speed values I use, or is there a specific one? There are several datasets available that provide speed information.

Best regards, Peter.

Hello Peter,

It's just about whether the engine control unit receives the information at all; it doesn't matter which measurement block you use.

Best regards, Rainer.

Hello Rainer!

Okay, I did a test drive, logged everything, and it's all there. The speed signal is present, and there are no error entries anywhere. So, what could be the problem?

Greetings, Peter.

Hi,

Well, I guess that's not the end of it.

Unfortunately, besides the motor bearings and their mounting, I can't think of anything else right now, sorry.

If there is too much play in the engine mount, a small piece of rubber (e.g., from an old tire inner tube) can sometimes help, depending on the design of the engine mount. This allowed me to successfully "recycle" the left-hand engine mount of my A3, extending its lifespan.

Best regards, Rainer.