AFN Performance Issues After ZKD Change?

Hello,

First of all, a big thank you to the forum and its moderators.

I was able to answer some of my questions by doing some research.

Now, regarding my problem:

I recently discovered that my Passat TDI AFN is losing coolant, and I couldn't figure out where it was going. After some time, I realized that the coolant was being blown out of the expansion tank ---> I suspect a faulty head gasket.

Then I disassembled the AFN (auxiliary unit) and replaced the timing chain cover (including the timing belt and pulleys).
In my case, the seal on the intermediate shaft was also leaking.

After the motor was inspected, taking into account the OT markings (KW, dowel pin in the ESP, and ruler).
Once it was reassembled, it started up again and seems to be running well.

Just in terms of the sound, it's now a bit harsher than before.
This morning I took my car to an independent garage to have the injection timing checked. The Bosch diagnostic program showed the following values:
Fuel temperature: 47 degrees. Injection timing: 3.4 degrees.
According to the workshop, it's optimal.
But something doesn't seem right, as the performance isn't quite there. The acceleration is very sluggish from around 160 km/h, and the top speed is about 180 km/h, whereas it used to be 195 km/h.

Can someone confirm the values?
What else could influence the performance?
Is it normal, as VW claims, for the head gasket to be a wear-and-tear part that needs to be replaced between 150,000 km and 200,000 km?
Before disassembly, I noticed that VW probably didn't do a perfect job during the last timing belt replacement. The crankshaft (KW) and exhaust camshaft (ESP) markings aligned correctly, but the camshaft was a few degrees off. The straight edge could only be inserted when the TDC (Top Dead Center) marking on the crankshaft was no longer visible.
Could this have had any consequences, or could it explain my current problem?

Best regards from the north.

Faxes.

Hello Faxe,

if you say that it would have run better before with 'incorrect' timing than with the 'correct' timing, then you might want to reconsider your definition of 'correct' and 'incorrect.'

Regards,
Thomas.

meyert wrote:

If you say that it would have run better before with "incorrect" timing than with the "correct" timing, then you might want to reconsider your definition of "correct" and "incorrect."

Hi everyone,

It's normal for the belt to become loose after a few kilometers. The position between the ESP wheel and the KW wheel may (and does not) change. I don't know why this is the case. If the belt were to stretch, the position between the ESP and KW would also change, which means there must be another cause for this phenomenon (e.g., a tensioner pulley?).

@Faxe:

The values in fields 2 and 9 of group 000 are crucial in the default settings mode. Was there an error entry (e.g., "injection start regulation difference")? Check the pressure hoses of the charge pressure control system; especially with old hoses, leaks are likely to occur after a head gasket replacement.

Hi,

I'm experiencing the same phenomenon with my AFN as well.
Once it reaches 140/150, it's game over; after that, it just declines slowly.
still high.

I cannot say whether the timing belt was replaced in my car.
I've only had the car for a short time.

In the workshop, the entire engine was inspected, and it was...
nothing detected.
Maybe someone here has an idea.

See you soon.

Hello,

'This weekend, a friend gave me a VAG 1522, and I tried to read the engine control unit data, following the instructions that haehnlein kindly provided.'

The engine control unit could not be accessed via diagnostic addresses 01 (engine electronics) or 11 (engine electronics II).
read out data from over 41 (diesel electronics)

Similarly, the ABS system was unresponsive, but the comfort control module, climate control, radio, and speedometer control functioned normally.

Are there any dependencies between the control unit and the tester, such that certain combinations are not compatible?


Regards,

Faxes.

Hello,

I finally have a VAGCOM adapter and can now connect to my engine control unit.
coming.
There are no error codes stored .

Now, my question is:

I tried to select function 04 (basic settings) to check the injection timing, following Rainer's instructions.
Is it correct that this is only possible with the full version?
Is there another way to check the injection timing using VAGCOM?

Greetings.

Faxes.

Hello everyone, this is my first time in a forum like this!
I have a 1996 Passat TDI with an AFN engine. Can anyone tell me where the vacuum hoses from the turbocharger control valve are connected?
One goes to the sensor for the throttle body, one goes to the air filter, and the third goes to the turbo on the 1Z engine. Where does it connect on the AFN 110hp engine?
Please help me!!!
bus11

Hello Faxe,

This is described in several places within the forum, explaining how it relates to the injection timing. Simply use the search function and do a little reading.
That can also be done without the full version.


Best regards, Garth.