Power Valve Actuator

[osageorange4]

I have 2002 QX4 . I was wondering what the Power Valve Actuator does and when it engages .

[rgk]

At low engine speeds vacuum is applied to the actuator, the valve is closed and air is diverted through a longer path in the intake to enhance maximum torque at low speeds.

At a preset engine speed the PCM de-energizes the solenoid, vacuum is vented from the actuator and the power valve opens. Air is then drawn through the shorter path, enhancing high speed power.