V6 TDI AKN issues with setting the injection timing using a dynamometer

Hello guys,

I've already mentioned my problem before...

Okay, so I'm having the following problem:

I installed new camshafts and a new fuel injection pump, and since then, the diesel engine hasn't been running properly at higher RPMs. Okay, so it pulls well from the bottom end, but it's really weak at the top. The maximum speed I've reached is about 230 km/h, which is okay, but it takes forever to get there.

After installation, I statically adjusted the pump using the adjustment pin. However, I can't adjust it dynamically. In the measurement block where the injection timing value is displayed in degrees, it shows 0. I also noticed that during the initial adjustment process, when the engine control unit switches between early and late timing every few seconds, the engine runs unevenly when it's set to "early." It feels like the engine is misfiring, but it runs normally when the timing is late.

Could it be that the pump is injecting fuel much too early? And is that why there are problems at higher RPMs (because it's injecting even earlier then)? Should I perhaps adjust it to inject later? But what raises further questions for me is: Why is "0" displayed in the measurement value block?

Regards,
AL

Are you talking about measurement block 0?
That's not degrees!

You might be way off the mark.
Why aren't you using the plugin in VAG-COM to adjust the injection timing?

Hello altonno,

The fuel injection pump is probably not installed correctly.

Disconnect the fuel injection lines and rotate the injection pump in the long slots counter to the engine's direction of rotation, approximately 4 mm further from the center of the long slot.

Retighten the fuel injection lines and perform the initial adjustment according to the repair manual. Injection start is indicated by 2.

Don't look at field 3 on the display. This represents the accelerator pedal position from 0 to 255.

Does VAG-Com, in its default settings, only control the ignition timing advance and not, as with the VAG system, alternately advance and retard the timing? Or am I mistaken?

Best regards, Manuel.

Please provide the text you would like me to translate from German to English.

Check the "start of funding" setting in measurement block 4, and then switch to the default setting.
While doing this, it rapidly switches between early and late timing every 10 seconds, and the engine sounds different as a result.
The correct value is then 2 degrees after OT (opening time), plus or minus 2 degrees, so potentially late.


Have you checked the error memory yet?
If the needle lift sensor is intermittently stuck in the "engaged" position, it is faulty.
And in this regard, he cannot determine the value (logically).

@Steffarn:

Hi,
Yes, the needle lift sensor is showing an error in the fault memory. Then it's probably because of...

Regards,
AL

altonno wrote:

@Steffarn: Hi, Yes, the needle lift sensor is showing an error in the fault memory. Then it's probably because of... Regards, AL

Is it the same with yours, where the error can't be cleared?
So, after turning off the ignition, the error codes were back in the error memory for most of them.

The funny thing about this is that you don't notice any loss of power .

Manuel V wrote:

Hello altonno, The fuel injection pump is probably not installed correctly. Disconnect the fuel injection lines and rotate the injection pump in the long slots counter to the engine's direction of rotation, approximately 4 mm further from the center of the long slot. Retighten the fuel injection lines and perform the initial adjustment according to the repair manual. Injection start is indicated by 2. Hi Manuel

In any case, you cannot reverse the pump .
You adjust it using the knob on the left camshaft.

@Steffarn:

The needle valve injector is always stuck. It cannot be removed and reappears immediately when starting the engine. I probably need to get a new injector. Unfortunately, it costs over 400 euros. I've already looked on eBay, but haven't found anything. Buying a used injector on eBay is a bit of a gamble... Does anyone have any idea where I can get such an injector cheaper? Or are there other injectors that might fit? From the 180 horsepower model, or something like that.

Regards,
AL

If it's not the needle lifter, please check the valve timing of the camshafts to ensure they are properly aligned, especially if they are only seated on a cone.

So, I carefully adjusted the camshafts during installation, and they seem to fit properly.

Regards,
Okay, please provide the German text you would like me to translate into English.

If you have a fault code related to the needle lift injector, you will not be able to change the injection timing. He is sticking to his 'fixed' value of 0 degrees.
Because the needle lift sensor provides the engine control unit with the precise timing of the injection.
I hope I was able to help you. Sure, here's the translation:

'MFG' is an abbreviation for 'Mit freundlichen Grüßen,' which translates to 'Sincerely' or 'Best regards' in English.