Problem: Zylinderaussetzer beim AKE | Posts 16+

I still have a small chance. I've met an Ing at Audi in NSU through some connections. I'll invite him for a test drive. He has the opportunity to view the data more quickly than we can with VAG COM, using the original BOSCH application software. (and of course, much more).

There, one could at least check whether it is actually a moment-to-moment intervention.

Otherwise: What do you think of the theory 'valve wear'?

knubbi wrote:

Otherwise: What do you think about the theory "valve wear"?

According to the article by MichaelII, the consequences are reduced performance and jerking. So, in principle, it would be possible.
"It is at least much easier to control than a hidden electrical fault."

Worn-out cam lobes will only lead to uneven power delivery (jerking) when they are EXTREMELY worn.

A brief glimpse (or upward view) of the camshaft can be obtained through the oil filler cap.

Performance loss also only occurs with heavily worn camshafts; otherwise, the car will still run perfectly with 8 faulty valves.
(I had; 8 levers broken, resulting in 8 valves being non-functional)

So, I wouldn't look for the error there.

Regarding the topic of cylinder bank shutdown: Neither Audi's documentation for the V6 TDI nor Bosch's documentation for the ESP mentions that a bank can be shut down and does so. Everywhere, the only talk is about the fact that the engine will completely shut down in case of fuel shortage in order to prevent the ESP from sucking air from the tank and destroying it.
Or does anyone have official documents from Audi/Bosch that describe it differently? Here you go.

By the way: What do the LMM measurement values indicate?

Stefan.

@stefan:
So, I once saw a training film from Audi where it - if I remember correctly - was about the V6TDI. It said that if the engine detects a fuel shortage, it first creates "misfires" from the control unit, which clearly inform the driver that the engine is about to fail. If this is not addressed, the engine is shut down BEFORE the fuel pump dries out. Therefore, this approach is actually not so bad, I think.

Maybe it would be a good idea to determine what resistance the fuel level sensor (assuming it is also responsible for detecting "full tank") must have. Then, based on the schematic, determine where this signal goes and then directly replace it with a resistor at the corresponding control unit. This is how you can rule out cables as the source of the problem...

Good luck...
Dirk

Hello Stefan, hello Brezelmann01!

First of all, thank you for your helpful thoughts. (I really need people like you now!)

The LMM values are normal. When the error occurs, the boost pressure reading appears as a single '1', but the air mass 'jumps, jitters'. As has already been correctly answered (for me), this is not necessarily due to a problem in the air path, as the turbocharger also lacks exhaust energy at that moment. I have replaced the pump (including the contact with the empty tank). I can now also rule this out. So far, I haven't yet investigated the wiring. I think I'd rather start the car before I start looking for it.

I have the official BOSCH manuals for the EDC 15, and I haven't found anything about 'desired engine off when tank is empty' yet. (But there are also a few pages) However, I will read a little further today.

Stefan, you're saying that the car can also run perfectly well with broken tow hooks? I can hardly believe that. You can see that, can't you?

When the error occurs, the whole car vibrates.

Best regards,
Knubbi

Okay, so

I just looked at the BOSCH EDC 15 documentation again. Da steht:

'Special Warning: Empty Fuel Tank'

Task: The VP 44 fuel pump must be bled by a third party after the tank has been completely emptied, therefore, it is necessary to prevent the complete emptying of the tank.

To this end, two signals provide information about the fuel tank level. If both signals show 'empty', the fuel pump is activated and, after a certain period (or fuel consumption), the engine is turned OFF. At the same time, error storage entries are created in order to clearly assign the vehicle's behavior to the customer service.


I think this is an interesting piece of information for this forum.

However, it doesn't help me further. My error log is empty.

Greetings

Knubbi