LMM Failure: Fuel Shut-off Valve - Mechanical Issue

Good day.

Since Sunday, I've been having a problem with my car, a 1997 Golf ALE. It seems to be running in 'limp mode' based on my estimate. The performance and the lack of turbo boost definitely suggest that.
In addition to the loss of power, another symptom is occurring: when starting, the engine revs up to 2000 RPM and immediately drops to the normal idle speed. This happens without any intervention from me and occurs almost every time the engine is started.
Today, I had the car's error memory scanned, and it found the following:
- Fuel shut-off valve N109 --> mechanical fault.
- Air mass meter -G70 --> Short circuit to ground / Open circuit.

I thought the mass airflow sensor was responsible for the emergency run mode. However, after using the diode simulation, nothing has changed regarding the emergency run mode! It's probably necessary to fix both errors first.
During the only start I attempted with an LMM replacement, the engine didn't rev up to 2000 RPM, but instead behaved normally.
Is there a way to test the valve, or should I just buy a replacement right away?
Do the errors need to be cleared before the normal performance can be restored?
According to information in the forum, the LMM (likely referring to a mass airflow sensor) is electronically connected to the valve. Could there be a connection between the two?


Have a nice evening.

Electronic contact exists between ALL devices in the car, because they are only powered by one battery .

If I suspect that something might be causing errors, I usually delete it first to see if the problem reappears or if everything is okay after that.

The LMM (likely referring to a mass airflow sensor) costs approximately 80 EUR for a replacement. The throttle body costs 42 EUR.

So, it's not the end of the world.

I'm not quite sure what's meant by the term "Absteller Fehler" (stopper error). Because, in reality, the stopper seems unnecessary, as the engine can be shut down by setting the control system (to a zero quantity). And then, the stopper itself doesn't contain any measuring components; the shut-off bolt simply falls into the HD line. How is the EDC supposed to measure this (especially since the control system is already set to zero at that moment)?

If the diode trick helped with the mass airflow sensor, repeat the process.

Sometimes the car runs better without the MAF sensor than with a faulty one (I experienced this with a loose MAF sensor connector that caused a reading of 0 air mass - without the MAF sensor, the EDC set a substitute value of 550 mg, and the car ran acceptably - when I plugged the connector back in, the loose connection suddenly disappeared, and everything was fine again).

Greetings.
m;

Check this out:
/viewtopic.php?t=15

Thank you for your previous responses.

For me, the key issue is whether the valve error triggers a failsafe mode. The link from Ulf suggests that it does (the illuminated spiral). Unfortunately, the spiral isn't illuminated for me, even when there's a significant error.
Ist die Diode denn von dem MSG erkennbar, oder sieht es wirklich immer nur die max. Air mass?
'If I replace the valve, do I need to clear the error memory, or will the car run normally immediately? I don't have a VAG-COM and would have to turn the key 50 times!'

I just wanted to quickly tell you what came out...

So, I replaced the LMM (likely referring to a linear motor module) with a diode, but unfortunately, I didn't regain the original performance. However, the ability to rev up to 2000 RPM was lost.
Then I examined the valve. It's nothing special on the pump itself, just a cable attached to it. However, I didn't want to remove it just for fun, so I only checked the voltage.
Ultimately, I decided against buying a new valve. I drove for another two days without any power, and then suddenly, it started working like it used to. I didn't clear the error codes, and I didn't restart it 50 times.

Would he perform better now with a new LLM? What MOTOR-related consequences does a diode replacement have? An increased soot output is not detectable.



Have a nice Sunday.

For me, the diode trick has only resulted in a significant decrease in power consumption.

CU Gremlin.