Mixed adjustment (add) - Adaptation limit exceeded

Good day


I'm having a small problem with an Audi A4 Avant automatic, ADR engine (1.8 125 hp), manufactured in 1996.
The error code '00561 - Mixture adaptation (add) - Adaptation limit exceeded' appears in the fault memory when the engine has been idling for a while.

In the measurement data blocks, the value 'Learned mix from (add)' in the 'Lambda Learning Values' field is permanently at -11.7%, which represents the limit value (Normal +/- 10%).

Initially, I suspected the mass airflow sensor (MAF) - 4.25 g/s of air mass at 860 RPM seemed a bit high to me. Tested other LLMs: Same result!

I thought so.
It's probably some kind of air leak issue. I replaced the crankcase ventilation hoses a while ago, but there are several places where they could be causing a problem.
'Bought a new intake manifold gasket, removed the intake manifold, and started searching.' And, as expected, I found nothing.
The hoses that I had replaced before were all fine.
The gaskets for the throttle body, intake manifold, and intake pipe looked okay, but I replaced them anyway.
Seals on the fuel injectors, also okay.

Well-built and running smoothly.
And still the same.
Okay, here's the translation:

'Hmm, let me think... 'Undernourished' actually means 'too fat,' not 'too thin,' right?'
Okay, with a deliberate introduction of a vacuum leak, the value fluctuates between -11.7 and -10.6.
Increasing the fuel pressure slightly reduces the injection time to 2.50ms... With a slight increase in airflow, the injection time drops to 5ms...

I'm a bit at a loss.
What kind of pain is the box experiencing?

Does anyone have any ideas?

Hello!

My neighbor has a similar car.
There were also several instances of the "mixed adaptation" error, specifically related to the adaptation threshold.

It's not happening anymore, and I don't know why.

I have cleared the error code multiple times, cleaned the throttle body, and reset the system.
It didn't help immediately.
Furthermore, the error consistently occurred in a specific location, namely near a high-voltage power line directly above the road and a nearby mobile phone tower.
Meanwhile, the high-voltage power line is located elsewhere; it was only a temporary construction measure.

He also had the problem of a frozen brake booster.
I think it's possible that the engine occasionally got a bit of water in it.
and perhaps the oxygen sensor reacted to it.

I can't pinpoint the exact cause.
However, this error has not occurred again in over a year.

Good evening, or 'Good night' .

The whole thing also appeared relatively suddenly.
I had the engine disassembled a while ago. Since then, the error memory has always been empty. Never had any problems.

However, what's noticeable is the immense fuel consumption. This thing guzzles fuel, consuming between 10 and 13 liters per 100 kilometers without any shame. Okay, the AG4 automatic transmission contributes its part to that.
But still, that's a lot.

Regarding the educational value.

It stays at the regulatory limit until 12:00 PM.
Starting at approximately 1500 RPM, the air-fuel mixture adaptation shifts towards -5.0%. Adaptation is -0.7% at 2200 upm and fluctuates between -1% and +2% at 4000 upm.

A peculiar vehicle.

'I think there's a vacuum leak somewhere...'
Idling is noticeable with the valve closed, and increases with engine speed.
as the throttle valve opening increases, the vacuum decreases.
less, which is also accurately reflected by the values shown here.

That doesn't fit with the error.
The blended amplifier is operating with a negative gain.
The error is 'VALUE EXCEEDED...'

I'm actually familiar with the issue of an engine running too lean due to a vacuum leak. Here are the symptoms:

- Oxygen sensor - exceeded limit.
- Mixed matching - Adaptation limit exceeded.

The bucket is telling me that I'm underspending?
That confuses me a bit.

[Translating...]http://wiki.ross-tech.com/wiki/index.php/00561

Okay, I'm ready. Please provide the German text you want me to translate.

Hello everyone

Let's get straight to the point:

Positive values indicate that more fuel is being injected to achieve the desired lambda value (the engine is running too lean). Negative values indicate that the engine is running too rich and less fuel is being injected.

Since it's consistently in the -11% range for me, it suggests it's running too rich, and it's constantly trying to lean out.
Interesting.

The air mass and temperature readings seem consistent, although I find the air mass value of 4.3 g/s to be a bit high.
I've already tested a different LLM, and the same error persisted.
Hmm, then it could only be a problem with the BDR (likely referring to a specific component) or the nozzles.

Funny!

Hello,

Dripping injector nozzle? It would also be consistent with the problem manifesting itself primarily when idling, i.e., at low fuel flow rates.

Best regards, Rainer.

The candlestick pattern might be. Provide insight.

The candle image might possibly. Provide insight.

I will definitely take the nozzles out again and check them again.
Interestingly, the spark plug readings look quite good for all the cylinders. I would say it's German Shepherd brown.

Recently, I drove almost 700 kilometers in the car.
With a high average throttle usage, it consumed approximately 10 liters per 100 kilometers. (Short AG4 automatic transmission / DSP disabled, forced Eco mode).