Pinbelegung LMM HItachi bei. Audi A4 B6 2,5 TDI | Posts 16+

Hello Richard,

"Thank you very much!"

I have VCDS installed on a laptop, but everything else is on my iPad, which is why I'm having this problem.

I did exactly what you described, and diesel is coming out of all the injector lines.

I bought the Audi in this condition, and I'd like to eventually get it inspected (TÜV) so that I can drive it.

I have very little experience with VCDS. I'll try to find out more information about the software.

Best regards,
Holger.

Oops, sorry...

I should try to identify which cylinder might not be firing correctly by checking the spark plug wires. I will investigate this.

It's strange that there are no changes when I disconnect the needle lift solenoid.


Regards,
Holger.

Hi,

Quote:

It's strange that there are no changes when I disconnect the needle lifter.

That's not funny; it's to be expected. The NHG (presumably referring to a specific regulation or standard) is necessary for regulating the injection timing.
Not whether it is injected at all.

Best regards, Rainer.

That's why the question is...

Could the needle valve lifter be responsible for the uneven engine running?

"Tomorrow, I'll check the injectors to see if any of them are misfiring, and then I'll measure the needle lift sensor. Voltage is reaching the connector, which I've already confirmed."

Otherwise, I'll have to spend more time using VCDS to perform the necessary measurements correctly. There must be a way to find the error.


Best regards and have a lovely Sunday.
Holger.

Hi there!

I would also like to investigate potential mechanical damage, specifically looking at things like the camshaft, broken cam lobes, and roller rocker arms.

The V6 TDI engines have long been known for a reason as being technically unreliable.

Remove the valve cover and check if everything is okay.

Hi there,
It's about a V6 TDI engine, specifically the BDG engine, with a VP44 fuel injection pump.
The car scan no longer shows any errors in the engine control unit, and the "MAF sensor short circuit to ground" problem has been resolved after replacing a blown fuse. This doesn't make sense to me, but it works.
The engine is still running unevenly.
It would be more sensible to first utilize the existing diagnostic tool (VCDS) in addition to the proposed mechanical tests. Measuring connections without a wiring diagram and known function assignments is rather pointless; for that, you need the repair manuals.
The car scan has already been requested. A file recorded with a laptop can be uploaded here in its original format, without needing to be photographed.
The next question would be about the idle speed control values per cylinder.
hg
Herbert.

Quote:

Could the needle valve lifter be responsible for the somewhat uneven engine running?

No.

Hello everyone,

Thank you so much for your support!

I will run another scan and post the results here.

How do I actually perform the idle speed measurement? I would like to provide these values.

As I already mentioned, I've only had the VCDS for a relatively short time and I still need to get familiar with it.

Thank you very much for the great support; without it, one wouldn't need to drive such a relatively old vehicle. I gladly accept any tips and suggestions.

Best regards.
Wood.

Hi there,
Am I understanding correctly that you've only tested the engine while it's stationary? It almost sounds like (...it's in the garage...will eventually get its inspection...). The engine certainly wasn't warm then. If the engine is running unevenly, you should also check for faulty glow plugs.
By the way, it seems your VCDS supplier is a bit vague about their support. The quote says, "We offer direct and free support for all questions regarding the VCDS software..." You could ask him more specific questions about VCDS applications. For example, you could ask him about displaying measurement blocks for the BDG engine. He would be a good contact person for someone taking an introductory course.

hg
Herbert.

Hello Herbert,

Yes, unfortunately, it looks like that. Since the weekend, the Audi has been parked in front of the building because I need to use the lift.

I purchased the Audi after it had been seized by the public prosecutor's office for two years due to a crime. Of course, not by me, but by the previous owner.

Unfortunately, the Audi Navigation Plus system is also missing, as it was seized as evidence and subsequently removed.

I already owned a similar Audi 10 years ago and drove it for 4 years, and I simply couldn't resist buying this one... I would like to get it inspected (TÜV) and then, of course, drive it.

I also let it warm up, and after a relatively short time, the idle speed drops. However, the engine runs somewhat unevenly and doesn't readily rev up when I press the accelerator pedal. It's like it's not firing on all cylinders.

But for now, I'm going to follow the instructions in order to get a more specific troubleshooting tip if possible.

I suppose I'll need to do some online research to learn how to properly use the VCDS software.

Best regards from the north.
Holger.

Thank you very much for that!

Best regards.
Holger.

Hello,

I've already installed new glow plugs and measured the compression at the same time.

Almost all cylinders are the same, with readings ranging from 27 to 29 bar in each case.

The engine starts easily, but it's not running smoothly yet.

I measured the variations in fuel injection amounts.

Cylinder 3: 2.67 mg/hour.
Cylinder 1: 0.31
Cylinder 6: 0.39
Cylinder 4: -0.78
Cylinder 5: 0.24

Cylinder 3 is currently also controlled by the needle valve distributor.

Is my assumption correct that the fuel injector on cylinder number 3 is defective?


Best regards,
Holger.

Here you can find the cylinder arrangement and ignition sequence for the AKN engine.
Ich kann den Inhalt dieser URL nicht abrufen und übersetzen. Bitte gib mir den Text, den du übersetzt haben möchtest.
The order should be the same for the BDG, i.e., 1-4-3-6-2-5.
The idle correction is specified with reference to the cylinder using the NHG ESD designation. This would actually be cylinder 3, and therefore it shouldn't appear in the correction values. That's why I'm surprised by your value assignments. Is something mixed up there?
hg
Herbert.

Hello,

Sorry, I thought the firing order looked like this:

Windshield.
3. 6
2. 5
1. 4

Cooler.




The engine code is BDG.

Regards,
Holger.

This is the V6 configuration, as shown in the link. The injector with needle lift control is likely located at the rear right side (windshield).
hg
Herbert.