Power loss and stuttering above 3000 RPM

Hello,

I need your help. My 1997 AFN with 268,000 km is not working properly. Since yesterday, on the highway, it stops accelerating at 150 km/h and vibrates as if it's running on 3 cylinders. When it's cold, it starts vibrating around 2400 rpm. What could it be? What could be the cause? "The boost pressure is consistently present, the mass airflow sensor readings are within the normal range, but occasionally the error message 00550 (injection start adjustment) appears, and the tractor smokes heavily when cold, like an old steam locomotive."

I should probably mention that it was -7 degrees Celsius outside yesterday when I tried to start it.

I hope you can help me or tell me what's causing this.

Sure, here's the translation:

"MFG" is an abbreviation for "Mit freundlichen Grüßen," which translates to "Sincerely" or "Best regards" in English.

Has the fuel injection pump, or its settings, been tested by someone who is knowledgeable about it? Also, has the fuel injection start timing been checked?

It sounds to me like it's just a misconfigured ESP.

"Frog cracker, filter on?" He shouldn't have a bad reaction to that.

A diesel filter issue wouldn't typically be noticeable immediately when accelerating from a standstill, would it? I also notice the jerking even without putting any load on the engine when I rev it up.

Regarding the pump: I've installed and configured several pumps before, so why wouldn't I be able to check mine?
Injection start at idle is correct (TDI graph).

It has now run for 8,000 km without any issues, and then suddenly it broke down at -7 degrees Celsius?!?

My guesses: crack in the cylinder head, piston damage, failure of the ESP (electric stability program), hydraulic lifter, or valve problem.

How can I determine this without directly removing the head?

Here's the translation:

What comes to mind immediately: Did the AFN engine also have problems with the crankshaft sprocket? Otherwise, I would take a closer look at it and check the timing before you start disassembling the engine. Best regards.

By the way, regarding the diesel filter: Yesterday, I had a V6 TDI with a flashing glow plug indicator and even engine misfires at idle! I wouldn't have thought it myself, but the cause was: the diesel filter was clogged due to poor quality diesel (it had solidified due to extreme cold).
verschandeln and everything is perfect!

Would you really replace the filter first, to continue watching?

TDI-Daniel wrote:

A diesel filter, however, doesn't usually become noticeable when accelerating from a standstill, does it? I also notice the jerking even without putting any load on the engine when I rev it up.

The pre-impeller pump, also the impeller cell pump, is relatively unimportant.
Whether it is running under load or idling at high speed.
It seems to me, as BM already wrote, that a heatwave is the most likely scenario.
What do your fuel lines say?

No, a change didn't help. The lines are also all free of air. I've dealt with a lot before, but nothing like this. Tap on scrap ESP.

Thank you for your help.