TDI Power Loss: Troubleshooting & Solutions

Good evening.

Recently, I haven't been able to reach the top speed of approximately 190 km/h with my 110 HP TDI. While I also think that's a bit low, as other drivers with 110 HP TDIs report speeds of almost 200 km/h on their odometers, the car is only registered for a top speed of 193 km/h. Currently, the maximum speed is around 170-180 km/h. } I think this can only be due to a loss of power in the engine. } For example, if I fully accelerate in 2nd gear, I feel (!!) that the power drops slightly around 1900 RPM. } However, that might be my imagination.
I once measured the voltage at the mass airflow sensor (MAF). It's at a maximum of 3.8 volts in the second gear at full throttle. As far as I know, it should be around 4.5 volts.
Can I conclude that the problem is caused by a faulty mass airflow sensor, or are there other possible causes?

I would be very grateful for a few tips.

Best regards, Torsten.

torsten1981 wrote:

I once measured the voltage at the mass airflow sensor. It's at a maximum of 3.8 volts in second gear at full throttle. As far as I know, it should be around 4.5 volts. Can I conclude that the problem is a faulty mass airflow sensor, or are there other possibilities to consider?

Hi Torsten,

Yes, other possibilities are being considered.

I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Which LMM (lambda measuring module) do you have, Pierburg or Bosch?

Hi,

I have a Bosch mass airflow sensor. I think I'm going to test what happens if I try to 'trick' the electronics with a diode.
I once had some damage to the right side of the car. That's where the intercooler is located. Could the intercooler, or a sensor nearby, have been affected?

Is there any other potential source of error that I could easily identify?

Thank you.
Torsten.

torsten1981 wrote:

I once had some damage to the right side of the car. That's where the intercooler is located. Could the intercooler, or a sensor nearby, have been affected? Is there any other potential source of error that I could easily identify?

...and is there a source of information that would allow one to relatively easily determine which model of car you are driving?

Oops... I'm, more or less, the proud owner of a Seat Leon. The engine is a VW design. It might have been clever to mention that earlier. Sorry.