Opel Astra G: Troubleshooting Performance Issues

Hello,

For quite some time, I've been experiencing a problem with my Astra where I have power drops at certain engine speeds.
For example, when I'm driving at 130 km/h, I have the feeling that the acceleration is happening in a wave-like manner. Furthermore, the turbocharger only really starts to work properly at 2800 revolutions. At speeds below 2800 revolutions, the acceleration is like a ship .
My fuel consumption has noticeably increased. I just barely passed the emissions test in February.
Based on my previous research, I suspect the mass airflow sensor, as the first one failed when the car had approximately 65,000 km. Now, it has 160,000 km.
I've also heard that it's quite common for the mass airflow sensor (MAF sensor) to fail every 80,000 to 100,000 kilometers.

Has anyone here had experience with the measurement signal voltages that the mass airflow sensor (MAF) should provide?
I received the wiring diagram from Bosch.

Pin 1: Temperature sensor.
Pin 2: Power supply voltage.
Pin 3: Ground.
Pin 4: 5V reference voltage.
Pin 5: Measurement signal [+]

Does anyone have a wiring diagram or a circuit diagram showing all the connections of the control unit?

HI.

Renewing the LMM (likely referring to a mass airflow sensor) would be one option, but first, let's check the error codes.
Read out the data and, if necessary, measure the parameters!

Recently, I had the error memory checked. There were no errors registered in the error memory. Everything was fine.
The value for the mass flow rate (LMM) was also displayed, but only when the system was stationary. I don't know what it looks like when the system is in motion.

I definitely received the complete datasheet for the mass airflow sensor from Bosch.
I will compare the voltage values provided by the mass flow meter with the specified values according to the datasheet. Let's see what the investigation reveals.

Hi,

Investigating the LMM values while the engine is running costs a fortune... You wouldn't notice the reduced power when parking in the garage, would you?

Best regards, Rainer.

Okay, after replacing the mass airflow sensor, I've achieved the familiar performance again.

Approximately 30% more performance than before.