Problems with AFN / Russ / partially. Power loss

Hello everyone,
A few weeks ago, I had a hole in a vacuum hose, which meant it wasn't producing any power.
Okay, here's something new:
1.9 TDI (AFN) engine, approximately 245,000 kilometers. Year of manufacture: 1996.

"There's quite a lot of soot being emitted, especially on the highway and in city traffic; it smokes quite heavily, black smoke, and the car gets dirty very quickly at the back. (However, it only smokes for a relatively short period, not constantly)."
partially. Power loss (very brief), this morning it wasn't reaching its maximum speed, only 180 km/h instead of the usual 190-195 km/h.
As far as I can tell, everything seems to be sealed correctly with the hoses. The boost pressure was lower last night in the garage, a maximum of 1400 instead of 1900. After restarting, it's back to 1865-1900. Fehler was at 575 17-00 last night.

LMM (Mass Air Flow sensor) replaced, new turbocharger wastegate solenoid valve, new air filter and diesel filter, sufficient vacuum pressure. Could it be the AGR valve (pressure also reaches here, or at the control unit)?

Is my Turbo about to cross the river Jordan? (Please, no!)

Thank you for your suggestions!

Please cover the AGR valve with a metal plate.

Are you from Vienna? New Town? (your username kind of gives it away...)

Hey, no, but I'm often in Wr. Neustadt (I fly for Diamond Germany).
I probably have two left hands when it comes to using AGR (agricultural) software.
Is it enough to simply unplug the connector at the AGR valve on the solenoid valve?

Hello,
I think I've found the problem: there's a hole in the LL pipe, right where the hose clamp connects to the bridge, and that's where the air is escaping.
Is that then the explanation for the "Russ" sound (when the EGR system is active) and the low boost pressure / low maximum speed? Don't laugh, I'm just starting to learn about this!

Yes, that would be the explanation. The turbocharger also mixes the exhaust gases with the incoming air and injects more of this mixture than the amount of fresh air available to the cylinders, which is why soot is produced.

The boost pressure isn't being reached because it's leaking. It's like trying to inflate a tire that has a hole in it. I'm pumping a lot, but the tire isn't reaching the correct pressure.

I think I've found the problem; there's a hole in the LL pipe, specifically at the bottom of the hose clamp that connects to the bridge, and that's where the air is escaping.


Congratulations - it's great that you were able to find the error so quickly .

Hey, no, but I'm often in Wr. Neustadt (I fly for Diamond Germany).


Okay, otherwise you could have packed your drone in the plane, and I could have looked at it the next time I come to Neustadt.

Yes, that would be the explanation. The mass airflow sensor (LMM) also mixes air into the exhaust it releases, and it injects more air than is available as fresh air to the cylinders, which is why soot is produced.

The boost pressure is not being reached because it is being vented.

Yes, that's correct - it's important to mention that eventually, the system will go into emergency mode and display the error 'Intake manifold pressure regulation difference' if too much air is lost.

A faulty turbocharger could also be the cause if you push an engine with a leaking turbocharger too hard.

Okay,
Thank you for your feedback.
I think an AFN (presumably referring to an auxiliary fuel tank) would *just* fit in a DA40, but probably not with any modifications.

Otherwise: Today, I bought a piece of hose, about 10cm long, from the local hardware store for €20 and installed it – and there you go, it's working again.
"Question: I disconnected the AGR connector. I read that it might be better to do so?" What's the benefit, and more importantly, is it enough to simply reapply for the AU (within 2 years) beforehand?

LG
Julian.

Question: I disconnected the AGR connector; I read that it might be better to do so?

Don't disconnect the electrical connector – that will create an error code. Instead, you need to disconnect and seal the thin vacuum hose that goes to the EGR valve.



What's the benefit, and more importantly, is it enough to simply reapply it before the annual inspection (AU) in 2 years?


Since I'm too lazy to explain this again -> /viewtopic.php?t=3095

No, there are no problems with the AU (presumably referring to a technical inspection or certification), unless the inspector notices sloppy workmanship that suggests something is wrong.