Mass flow meter / Mass flow values for gasoline engines (Solution)

The air mass meter measures the air mass available for combustion. A motor power x requires a corresponding available air mass y, small deviations are possible due to the respective lambda value at full load and the design.

Are there frequent deviations in the additive and multiplicative adaptation of the lambda control, indicating that it is faulty or measuring distorted values?
When there are significant deviations, the gasoline engine will exhibit malfunctions such as jerking, stalling, or loss of power.

To perform a basic plausibility check of the air mass flow rate, you can use the following procedure using VCDS:
- Determine the motor's power rating (e.g. Vehicle documents)
- Power in kW * 1.1 = Estimated required air mass in g/s

The test should be carried out under "normal" operating conditions (normal pressure, 20°C), and under hot weather and at higher altitudes, the available air mass decreases.

Of course, the intake path must not have any leaks, meaning the car must otherwise be in good condition.
If the intake path has a leak, the amount of escaping air will be measured, which will naturally produce zero horsepower. For leaks, significant negative deviations in the additive and multiplicative adjustment values of the lambda control rule are observed at relatively high air mass values.

See also: /viewtopic.php?t=21836