MSW: Disassemble or Reduce Fuel Injection

Hi!
My Golf TDI 1Z / 66kW with 300,000 km has been experiencing noticeable vibrations for quite some time. After the shaking in the 1300-1 to 2100-1 RPM range, which was particularly noticeable in the 4th and 5th gears but also in the 3rd gear, became increasingly worse, I decided to investigate the cause.
A look at the error memory didn't help me, as it was empty.
After some research on the forum, it became clear that the quantity control system of the VP37 was the culprit. I disconnected the speed sensor, and the jerking stopped.
The symptoms (stalling in the specified RPM range) likely indicate a sticky MSW.
Before I attempted to disassemble the MSW, I checked the fuel injection amount at idle. This was at 2.0-2.2mg/stroke. – Therefore, within the VAG specified values (2.0 - 9 mg/stroke), but still outside the "recommended" range (according to /viewtopic.php?t=658, at least 3mg, or according to /viewtopic.php?t=5517, between 4 and 5.5mg as standard).
Now, using the VAG-COM according to /viewtopic.php?t=658, I increased the values to 3.8mg. -> As a result, the jerking became less noticeable (smoother), but it is not gone.
Now, I'm wondering whether further raising the values, in the sense of a mechanical "thinning" of the MSW (moving the pump top with the control system on the pump body), would be sensible, or whether I should disassemble and verschandeln the MSW.
Personally, I think that cleaning the MSW will be more effective and will actually solve the problem at its source. Do I see it right?

P.S.: Actually, I intended to post this thread in the "Diesel - Engine Technology" section, as it's more appropriate there. Perhaps a moderator will move it?

[Translating...]

Nachdem mir niemand antwortete , zerlegte ich kurzerhand das MSW. Nocheinmal einen herzlichen Dank zum Verfasser des VP37 zerlegen Artikels!
Da war soviel Dreck drin, kann mir fast gar nicht vorstellen das da noch etwas von der Pumpe da ist . Das ruckeln ist jetzt komplett weg. Mal sehen wielange das Vergnügen anhält...

Hello,

After having read numerous threads on various forums about the TDI engine's rough running issue, here's my 10-cent worth of knowledge and my approach to solving the VW TDI rough running problem.

Because I think I should also contribute here, as the forum was so helpful when I was getting started.


Impacts:

TDI engine stutters or hesitates during acceleration or partial load; unstable idle. No check engine light (i.e. (MOT) possible.


Options:

According to forums, some customers had to replace almost everything in their cars. This included the air mass flow sensor, pedal position sensor, and even the ESP. I experienced anxiety sweat while watching the plays described. (My vehicle diagnostics also gave me nonsensical information: "Pedal position sensor defective, value blablabla...")

Often, exchanging expensive replacement parts or even the entire fuel injection pump is unnecessary. (My research: Original price 2700.- / Replacement 1600.- / Bosch cleaning+ installation probably around 600-800.- (assuming that the relevant Bosch Car Service even has a diesel test bench))


Solution

As it appears, cleaning the volume stacker (the upper part of the ESP) helps in 80-90% of cases. There is also a relevant, illustrated technical article/download available in the forum, which is causing great excitement among experts.

This does not require a complete expansion of the ESP. The work can even be carried out by one or two people in the engine compartment, even with integrated mass flow meters. However, it seems that removing [EDIT: the MSW] and performing a previous data read-out with VAG-COM is the better method.

Despite using VAG-COM, I didn't initially believe I could do this myself, as it's a tight space, and I need the car frequently, so I can't afford to make any mistakes.

I have finally found a workshop that specializes in cleaning and precisely adjusting the MSW. (I am happy to provide you with the address and phone number of PSM upon request.)

In the end, I got away with it for a super cheap price of 150. ( + 50 .- fuel) Lasted 2 hours and 5 cups of coffee.

After that, I no longer had a chaotic learning process, no more disruptions, and I no longer failed in the ASU (presumably an assessment or exam). The next day, I received a perfect outfit at my GTÜ!

As a bonus, the men also informed me that my temperature sensor in the charging unit was defective, and that this was the reason why I occasionally experienced a sudden drop in performance when running at full load. With 25, that's also finished.



_{DIY Tip:
Simply use a hammer to split, unscrew, and discard the "triangle screw" of the MSW! Subsequently, replace it with a standard M6x60 screw!}

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