A2 1.2 TDI Turbocharger and EGR Problems

Hello everyone in the forum community,

I'm new here and I already have a problem with my Audi.
It's basically just idling, it struggles to reach 2000 RPM and then stalls.
The error memory is empty, even with the engine running.
Reading the data blocks reveals the following:

14:03:32 Block 011: Charge pressure control.
840 revolutions per minute (RPM) motor speed (G2).
999.6 mbar boost pressure (target value).
979.2 mbar boost pressure (actual value).
80.5% duty cycle for magnetic valve (N75).

14:03:32 Block 003: Exhaust gas recirculation (EGR).
840 revolutions per minute (RPM) motor speed (G2).
235.0 mg/m³ air (target value).
294.0 mg/m³ of air (actual value).
79.7% duty cycle of the AGR valve.

At a certain speed.

14:04:27 Block 011: Turbocharger pressure control.
1827 revolutions per minute (RPM) motor speed (G2).
1662.6 mbar boost pressure (target value).
979.2 mbar boost pressure (actual value).
31.1% duty cycle for magnetic valve (N75).

14:04:27 Block 003: Exhaust gas recirculation (EGR).
1134 RPM motor speed (G2)
1000.0 mg/Nm³ air mass (setpoint).
249.9 mg/m³ of air (actual value).
4.8% duty cycle for EGR valve.

The turbocharger was removed and completely disassembled, but no issues were found. The solenoid valve has been replaced. I find the difference in air mass particularly noteworthy. Also, despite the lack of air mass and boost pressure, the control valves are not fully open. Does anyone have any tips or know of similar problems?

Quote:

At a certain speed

Please read the values from measurement block 11 after applying full throttle for at least 2 seconds, for example in 3rd gear.

Error memory?

Then back to...
/newuser.php

Best regards, Rainer.

Hello Rainer,

Unfortunately, that's not possible. The car won't move. The tiptronic transmission cuts power when trying to shift gears due to a lack of power. When idling, it takes approximately 2 seconds for the engine to respond with the accelerator pedal fully depressed.
to get it started. Then he holds the RPM for about 3 seconds and then begins...
It's terrible how the valves are ringing; it causes an immediate drop in pressure, which then makes it stall.
It is an ANY motor.

Best regards, Schraubär13.

Hi,

Then it's also impossible to measure the boost pressure, and frankly, it wouldn't be useful anyway with an engine that sounds so awful.
Just take that thing apart and see what's wrong.

Best regards, Rainer.

Hi.

As I mentioned in my previous question, I had removed the turbocharger, including the variable geometry turbine (VGT).
Completely disassembled. Everything appears normal, with minimal signs of storage wear. No metal shavings detected, and the VTG (variable transmission gear) is smooth and also shows no abnormalities.
I have now pressure-tested the LDK (including the hoses) to 2 bar without finding any leaks. Since the LD sensor is located in the LDK, I was able to verify its function as well, and it is also working correctly.
I'm slowly running out of ideas about what else I could check. Could it be a broken oxygen sensor?
Realistic? What engine speed should the turbo achieve at idle with a completely open variable turbine geometry (VTG)?
I am grateful for any suggestions or solutions.


Best regards, Schraubär13.

You just mentioned that the engine is making a noise. I would start by disassembling it there to investigate.

Hi Rainer,

The engine starts making a ringing noise when I rev it up more than I should.
and hold the engine at a momentary point between 2500 and 3000 rpm, which is its maximum speed.
It makes no noise when briefly revved or idling.
It's quite noticeable that the mixture composition is inadequate.
The engine is subjected to extreme thermal stress.
I consider a motor defect to be unlikely.

Best regards, Schraubär13.

Maybe your catalytic converter or exhaust system is clogged? Have you checked it?
Screw it in behind the loader and do a test.

Hello!

We are always eager to hear how things turned out, so please let us know.

I also drive a 1.2 TDI ANY.

Hi,

Is the problem already solved?

Quote:

1000.0 mg/Nm³ air mass (setpoint). 249.9 mg/m³ of air (actual value). 4.8% duty cycle for EGR valve.

At 4.8%, the EGR should be completely closed, but the air mass corresponds to approximately what is indicated when the EGR is fully open. Is it certain that the EGR is actually closing properly?

Best regards,

Jan.

Is he getting enough fuel?

MWB 13 and 23 at idle .

Well, it seems like there's nothing more to add, completely wrecked?