Can an ESP provide incorrect values?

I'm having this problem, and maybe someone can help me.

So, in my case, the ESP was replaced four weeks ago because the old one was defective.
Zahnriemen und alles andere was dazu gehört wurde auch gewechselt. Keilrippenriemen und alle Rollen wurden auch gewechselt. Die Einstellungen wurden alle bei Audi gemacht und sind alle i.O. Jetzt ist folgendes. Wenn der Motor kalt ist ruckelt er bei einer Drehzahl von 1600 bis 1800 Undrehungen. Darunter ist nichts und wenn er darüber ist ist auch nichts. Hat er die 80 bzw. 90 Grad erreicht ist alles weg und er läuft absolut sauber. Leistung ist alles da. Dieselfilter und G62 wurden heute gewechselt. Audi ist jetzt auch ratlos. Sie fangen jetzt an zu raten. Ach übrigens ist der Fehlerspeicher leer. Kann es sein das die Pumpe in diesem Temperaturbereich falsche Werte liefert so das falscher Mengen eingespritzt werden? A cloud of smoke also comes out of the exhaust.It smells like it's burning uncleanly. That's my impression.

Questions upon questions. So I can't answer any of them for you if I don't even know what they are about.

The question is: Why does it vibrate when it's cold at an engine speed of 1600 to 1800 RPM?

vb2 wrote:

Die Frage ist: Warum ruckelt wenn er kalt ist bei einer Drehzahl von 1600 bis 1800 Umdrehungen??

I already understood that; I'm not as dumb as I sometimes sound. What I mean is that some data about the vehicle seems to be missing.

Ja siehst du jetzt ist ja klar wer hier der Hammel ist.

Okay, it's a...

A6 4B 2.5V6 TDI, manufactured in February 2000, with 217,000 km mileage. Engine code: AKE. Automatic transmission, Quattro all-wheel drive, Avant (station wagon) body style.

Let's try a different question: Why was the pump replaced? What were the symptoms before?

The water pump failed at 217,000 km. And the timing belt was also due for replacement because the previous owner had it changed at 97,000 km.

vb2 wrote:

Die Pumpe hat ihren Geist bei 217Tkm aufgegeben.

What does that mean? Did he not run at all, or were the problems almost as bad?

He hasn't run at all since then. And Audi later discovered a pump defect.

So, have you definitely never experienced any jolting or jerking issues before the pump replacement, or did you?

How is the vibration? Is it very strong and noticeable, or rather subtle?

It was running perfectly smoothly before.
Okay, how should I describe it? It feels like it's not running smoothly, as if something isn't quite right. Calling it "difficult" would be an exaggeration.

Hello everyone!

@vb
It's also a bit annoying to have to address the same topic for the third time... *note*
z. B.: /viewtopic.php?p=160200&highlight=#160200

Here's the translation:

z. B.: }/viewtopic.php?p=160200&highlight=#160200}


If you don't immediately receive a flood of responses, it may simply be because no one has a clarifying answer for you at the moment.

Best regards from Munich!

Unfortunately, I also couldn't find a topic using the search function that answered my question.

Hi there,
Your V6 engine has the VP44 ESP.
This is a radial piston ESP (Electrical Submersible Pump) with an electronic valve for flow control.
Unlike the VP37 (ESP in the 1.9 TDI), which has an axial piston and a mechanical control slide for regulating the fuel flow, ...
The regulation for the start of pumping in artificial lift systems is often achieved using ESPs (Electrical Submersible Pumps) with a check valve that is shifted by the internal pressure of the pump.
The internal pressure within the pump is approximately double that of a standard system (up to about 20 bar).
If the supply line is not free of air bubbles, the internal pressure of the pump will suddenly drop, and the injection control piston will forcefully strike its stop.
With a diameter of approximately 20mm, the resulting stress can be quite significant and cause the coated aluminum of the nozzle adjuster to wear away.
That's why the VP44 is so sensitive to air.

The VP44 has an internal type of foil wiring connecting the control unit to a sensor that measures the angular position of the ESP shaft.
I believe the problem lies with your ESP... so, a pump replacement is needed!

The VP44 pump delivers up to 1750 bar at the injector, and at that time (around 1998?), it was superior to common rail systems.

Best regards, Schorsch.

I just had a very interesting conversation on the phone.
My current setting is 1.6 degrees off from the optimal timing (OT). However, it's recommended to try and adjust it to be between 0.2 and 0.4 degrees closer to the optimal timing. The man says it's a lot of work, but it's worth it.
Audi specifies a value of 0 to 2 degrees after top dead center (TDC). While mine is within that range, it could still be the cause of my problem.
But thank you for the information.

Hi there,
I found something beautiful...
Sure, here is the translation of the text from German to English:

"This is a description of the VP 44 with pictures."
Da sieht man schön die Folienleitung vom Drehgeber zum int. Control unit.
Below is the injection molding machine, which then breaks down when exposed to air.

http://avlditest.eu/wGerman/news/press/press02.pdf

Best regards, Schorsch.