Pressure adjustment

F9Q or K9K

Essential special tools
Tool 1014	Turbo boost pressure check and adjustment kit and engine leak detector

BOOST PRESSURE CONTROL VALVE

F9Q

1 - Check

Note: The check and the adjustment cannot be carried out with the turbocharger installed.

• Remove the turbocharger (see Turbocharging chapter).
• Use a magnetic base fitted with a dial gauge positioned at the end of the control valve rod (as far as possible in line with the rod).
• Gradually apply increasing vacuum to the control valve using the gauge (Tool 1014).

2 - Value

• For a vacuum value of 265 mbar, the rod travel must be between 0.5 and 3.5 mm.
• For a vacuum value above 600 mbar, the rod is at its stop.

3 - Adjustment

Note: During a check, it is possible to adjust the length of the rod of the boost pressure regulator valve (1) (pressure out of tolerance).

• Loosen the locknut (2).
• Adjust by turning the knob (3) in half-turn steps, clockwise or counterclockwise, until the correct calibration pressure is obtained.
• Turn the knob to increase the calibration pressure.
• Turn the knob to decrease the calibration pressure.

Note: Check the setting after tightening the locknut (2).

• Confirm the repair with a road test, checking the "boost pressure control valve duty cycle" and "boost pressure" parameters on the diagnostic tool.

K9K

• Boost pressure adjustment is not possible