Note: The wastegate valve operates on the opposite principle to conventional wastegate valves.
In the absence of control pressure, the boost pressure is limited.
Make sure the connections between the vacuum pump and the boost pressure limiting valve are tight.
Checking the calibration pressure
Performed on vehicles with F9Q 754 engine.
Use a magnetic indicator. The indicator is mounted on the end of the boost pressure limiting valve stem of the pressure regulator (as close to the boost pressure limiting valve axis as possible).
Gradually create a vacuum in the boost pressure limiting valve using the Mot. 1014 pressure gauge.
Attention! To check the calibration pressure on the F9Q 750 engine, it is necessary to remove the turbocharger.
Calibration values
