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

13-04-2012, 8:37 Subject:

Herbert wrote:

The 1Z engine was also installed longitudinally in the Audi.

That's correct. The 1Z engine, like the AFN, was available in both longitudinal and transverse configurations.

Okay, I've changed it in the original post.

13-04-2012, 8:53 Subject:

You don't need to check the VTG (variable turbine geometry) on an AHU engine because it has a wastegate turbocharger.
The boost pressure shown in the diagram is quite good for the amount of air mass.
If the obvious possibilities like a blocked air filter, obstructed intake path, or a faulty catalytic converter have been ruled out, I would start looking at the mass airflow sensor (MAF) or the exhaust gas recirculation (EGR) system.
Please record the measurements for MWB 3 in the LL (low-load) condition and under load, as well as the measurements for MWB 10 and 11 under load.
Close the AGR for testing purposes as well.
hg
Herbert.

13-04-2012, 9:26 Subject:

Hello Herbert,

Thank you for the tips... I'll take a closer look at it during the weekend. The catalytic converter should be fine, as the exhaust emissions passed the "Contrôle technique" (technical inspection) last week, so I think the catalytic converter is in good condition.

Hmmm, okay, here's a silly question, but how is the best way to disable the EGR valve on this engine...? Just by unplugging the connector? Or is there something else, like putting a piece of metal in it?

I will be conducting the measurement tests with him tomorrow.

Regards...

13-04-2012, 9:54 Subject:

It's best to use a mechanically locking mechanism because you never know for sure if it will automatically release on its own

.

13-04-2012, 10:12 Subject:

"Well, I guess your TÜV (German technical inspection agency) doesn't do much more than ours. The measurement will probably only focus on the opacity, and won't test the effectiveness of the catalytic converter... but whatever."

Tapping

is faster than typing anything }, and you instantly become smarter.

13-04-2012, 21:05 Subject:

Hi,
For temporary sealing: Metal. Permanent sealing is not permitted due to exhaust emission regulations.
Schraube auch mal den Kat auf der Motorseite ab und schau rein. Ist noch besser wie Schütteln, da klarer Einblick, und betrifft drei Schrauben.
hg
Herbert.