AAT Injection Start Regulation

Hello!

Okay, here's a silly question: Is there any operating condition where the injection timing is later than it is at idle? I think the injection quantity will never be lower than at idle, or will it? (Except maybe with cylinder deactivation, but in that case, the injection timing doesn't really matter anyway, does it?)

Here's the translation:

'The reason for my question is that my static injection start timing is adjusted so that, at idle, the control system doesn't quite have to fully adjust to achieve the injection start timing desired by the engine control unit (ECU) at low load! It should actually be okay, right?'

I've read a lot of articles about pump settings, but they don't mention anything about idle values.

Greetings.
Andi.

Hi,
It never idles lower than it should, or at least it has never noticeably tried to. Under load, it tends to advance the timing slightly, around 9 volts at the fuel injection control.
With an injection start timing that was slightly delayed even at idle, my AAT (presumably an engine type) was not starting well. However, it's also possible that my fuel pump is not working at 100% efficiency.

Um hm, a quick question:

"-3.1 degrees" in VAGCOM means 3.1 degrees AFTER TDC (Top Dead Center), which implies a maximum late ignition timing.

Because under load, it reaches 9 degrees.

I had previously asked about the somewhat inaccurate start time of my first injection, and I just realized that I obviously mixed up the early and late times.
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Thank you for the clarification.
m;

While I can't provide definitive answers since I'm not familiar with VAG-COM, a multimeter and oscilloscope can reveal almost everything!

If it goes to '9' under load, then positive numbers should indicate an earlier injection start (which, for me personally, seems illogical ).

Given your uncertainty, I would suggest connecting a VAG-COM diagnostic tool, checking the injection timing, and then disconnecting the solenoid valve for injection timing control. The value displayed then will represent an earlier injection timing (and the engine knocking should also be audible!).