Turbocharger boost pressure too high (AEL)

My 1996 A6 2.5 TDI occasionally experiences power loss under full load. If I briefly press the clutch pedal, the car then runs normally again. The error memory showed the message "Intake manifold pressure too high." I'm now suspecting that the wastegate on the turbo is stuck, which is causing too much pressure to build up, and that's why the engine control unit is probably reducing the fuel injection.
I've now taken a look at the turbo from the outside, but unfortunately, there are no levers there that I could easily make more responsive. Does anyone have a repair manual or instructions on how I could repair the turbo?

Best regards.

Hannes.

Hi,

even with the risk that my diagnosis might be a shot in the dark:
It seems that your turbo is working properly.
Instead, the 'wastegate solenoid valve' should be replaced.
It's also significantly cheaper...
I'm familiar with those symptoms from my Golf 1Z.
After the exchange, everything was fine again.

If the problem isn't with the valve, you can insert a steel wire through the connection pipe to check if it's clear.
With my AAT (presumably referring to a specific type of audio equipment), this affects the plunger (and not the membrane...).
If you don't want to replace the valve as a precaution, you can also directly connect the hoses to the valve. However, the engine will then have less power, especially at lower RPMs. The burglaries should then stop.

Is the pressure relief valve in an AEL system not actuated by vacuum? I can't really compromise on low-end power; the car is already heavy and takes a while to get going (there's not much happening below 2000 rpm), and since I often drive in the mountains, that would be quite annoying.

@Markus H.:
Where is the magnetic valve that limits the boost pressure actually located? Maybe I'll take a look at that.

Best regards.

Hannes.

If it's related to a vacuum, the wire probably won't help.
If no one here can help, I would simply trace the hose from the turbo to the valve. It's probably located on the injection manifold, like with the AAT. From there, proceed to the source of the pressure (whether it's positive or negative pressure).
"Short-circuiting" the pressure lines only works effectively with pressure control systems that already have a complete control loop, as the electric valve then only intervenes to make corrective adjustments.
You should only accept the reduced performance if it's for testing purposes. The error must be fixed permanently.

Hi,

Hannes,
I could now go into great detail describing where this thing is located in the engine compartment.
It would be easier if I sent you an email with the diagram.
Unfortunately, you have not provided an address in your profile.
Therefore, I suggest you send me an email. Then I will have your address and can send you the diagram as a .jpg image.
Everything is clearly visible.
(You can find my email address in my profile.)

Hi Markus!

Unfortunately, I couldn't find an email address in your profile, so I sent you a private message. It would be great if you could send me a graphic.

Best regards.

Hannes.

Hi,

@Hannes:
You have mail.
I hope it helps.