Audi A6 2,5 TDI BDG stottert bei Teilllast obwohl VP44 neu | Posts 16+

Update:

Yesterday, I replaced all the hydraulic lifters, including the rocker arms.
Some of the linkage levers were quite worn on the "Hydrositz" (hydraulic seat), so we replaced them all at the same time.
The timing belt has been replaced and properly tensioned.
The "egg-shaped" camshaft gear was also replaced.

Conclusion: The engine is running just as poorly as before.

There is still a significant difference between the desired and actual injection start time (see attached image).
I was also told that the injection amount is far too high, at 7.2 mg/H (see the attached image).
For a vehicle with the same design, even with a newly refurbished pump, the injection quantity is 5.0 mg/H.

I'm now quite certain that my newly refurbished fuel injection pump is the cause, or what do you think?

I will return the pump to the company for a re-inspection.

Sure, here is the translation of the text from German to English:

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

Check the start of injection using VCDS and the TDI timing checker.

It's best to post a Screenshot.

I've just scrolled through the topic again, and I don't see anything about setting the start of the injection. I mean, it doesn't just happen automatically; you have to do something to initiate it.

Best regards, Rainer.

Hello, I have set the injection start point to -2.0.
I've already removed the pump; it will be returned tomorrow.
I will report back after it has been checked.

The start of injection still showed a significant difference between the target value and the actual value.

Sure, here is the translation of the text from German to English:

"Lg" is a German abbreviation that stands for "Liebe Grüße," which means "Best regards" or "Warm greetings" in English.

Adel wrote:

Hello, I have set the injection start point, and it is currently at -2.0.

And was the injection timing stable in the graph from the TDI timing checker?

Please excuse the delay...
I wouldn't want to keep the solution to the problem from you.

It was actually due to the "new" fuel injection pump.
I returned it and received a new one, installed it, and everything is working perfectly!
It definitely cost me a lot of nerves, but now it's working again like it should .

Thank you for the feedback!