Leistungsmangel A4 Avant 1,9TDI - 90PS AHU 1996 | Beiträge 16+

[quote="Herbert"]The 1Z was also installed lengthwise in the Audi.[/quote]
Correct. The 1Z was available both lengthwise and widthwise, just like the AFN.

I've made the change in the original post.

At the AHU, you don't need to check the VTG; it has a wastegate.
The boost pressure shown in the diagram is quite good for the air mass.
If all the obvious possibilities (air filter, intake path, catalytic converter) have been ruled out, I would look towards the LMM or AGR.
Please draw the MWB 3 and 10/11 under load, including the AGR.
[For testing purposes] close.
hg
Herbert

Hello Herbert,

Thank you so much for the tips… I'll take some time this weekend to look into it properly. However, the catalytic converter (KAT) should be fine, as the emissions were checked during the "Contrôle technique" (TUV) last week… I think the KAT should be in good condition.

Hmm, but I have a silly question: how can I best close off the AGR (Exhaust Gas Recirculation) system on this engine? Just unplug the connector? Or something like clamping a piece of metal in?

I'll then check the sensor blocks tomorrow…

Best regards…

Best way to close it mechanically because you never really know if it will stop on its own.

? Well, I guess your TÜV doesn't do much more than ours. The measurement will only focus on the opacity and not test the effectiveness of the cat... but that's fine.

Putting it down and hammering it in is much faster than typing anything and you'll immediately understand.

Hi,

For a test closure: Metal. Permanent closure is not permitted according to exhaust regulations.

Also, unscrew the catalytic converter on the engine side and take a look. It's even better than shaking, as you have a clear view, and it involves three screws.

Best regards,
Herbert