Golf IV 1,9 Tdi AXR ruckelt unter Last (Solution) | Posts 32+

Check if the exhaust paths are clear, as he can't suck something in if he can't get it out.
"That would also fit your log, I think, that it falls back down again around 2500 RPM."

Greetings

Yes, thank you for the tips.
I will look into that.

I am currently looking for a workshop that can inspect the air intake system and the vacuum system for leaks and pressure.

Quote:

Air intake length and ... checks for leaks and pressure.

You can save yourself the trouble of checking the air intake for leaks.

Why?

Because the air mass flow meter measures the amount that passes through it.
If there is a leak in the air intake system, air escapes, and the mass airflow sensor then sucks in more.
However, your air mass values are too low.

So, either both air mass sensors are defective, or only one, or none. However, a leak in the intake system would cause such high values that a functioning car with a defective LMM would not be able to move at all.

Okay?

Furthermore, the haze detection on the AXR system is already handled by the LD/LLT sensor.
The LMM doesn't need the ECU - once the AGR closes at full throttle.

Your logs indicate a blockage in either the intake or exhaust side. If the approximately 140 horsepower, which are limited by the torque limiter, were actually able to be unleashed – then I would definitely start looking in the direction of the Kat.

Because the sharp load control starting at 3000 rpm, in combination with the low air mass, appears to cause clogging in the loading transfer paths.

As Rainer says, the path after the compressor can be ruled out. So, the remaining tasks are: intake and exhaust pathways.

Thank you all!
That's really helpful to me!

I will then check (get checked) on the following items:
- Camshaft / Hydraulic Lifter
- Cat/ Intake and Exhaust Pathways
- Vacuum System

I will keep you updated...

Best regards,
flexbeat

Okay, once again, thank you to everyone, and especially to Autoservice, klahaui, and Blackfrosch.

I think I've found the error:

At least one piston is severely damaged; I'm assuming there's a hole. I tried to capture it as best as I could with the camera.

Here's the translation:

Here's the text again, specifically for those without glasses

Hi,

Am I being fooled, or is your oil milky, like it has water in it?

Greetings
Adrian

jarobaldu wrote:

Hi, Am I being fooled, or is your oil milky, like it has water in it? Greetings Adrian

It's normal to have some soot in the oil, which is normal

Hello

Wanted to ask what kind of oil was used, LL or not?

Best regards. Thomas from Vienna

I just read the post, but after watching the video, I'm betting on a faulty camshaft or hydraulic system.

Is usually quite easy to diagnose. Open the air filter housing, start the engine, and if you then hear a strong rattling sound, the NW and hydros are usually worn out. In extreme cases, and where there are still hoses going to the intake, you will feel it when you attack the hoses.

Blackfrosch wrote:

Außerdem, die Trühe wird sowieso über den LD-/LLT-Sensor gemessen. The LMM doesn't need the ECU - once the AGR closes at full throttle.

The smoke limitation also works through the LMM for this control unit, or MTM has changed it to LD.

Otherwise, the injection quantity would also decrease in the log in MWB 8/4, as we still have 1900 mbar at 3000 1/min

Thank you also for the remaining responses!
I think it's great that I can still learn so much here in the forum,
...otherwise it would be very difficult to even see through all the intricate details of the engines.

@tomsyncro
As long as the car is in my possession (the last 45,000 km), I have used the following oil: 5W-30 Longlife III Pennasol, but the replacement was done every 15,000 km.
Once, the garage probably used 5W-30 from Castrol, but I can't say exactly which one it was.

As far as I know, it doesn't matter much about the oil, as long as it's suitable for PD engines. There were issues with the hardening process.

Okay, I also want to provide some feedback here:

I replaced the camshaft and pistons with a colleague over the weekend; the car is now running perfectly again. One of the pistons was severely damaged (crushed with a hole in the middle), unfortunately, we didn't take any pictures during the removal, but I can send you a picture of the damaged piston. The corresponding groove on the shaft was already very worn.

The engine and car have regained their usual performance, and driving is fun again.
Thank you again to everyone for your help, I've learned a lot here.

Thanks again for the feedback