Manifold Tuning Valve
WARNING: This page is about a different car, the 2003 Dodge Intrepid, 2003 Chrysler Intrepid, 2003 Chrysler Concorde, and 2003 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The Manifold Tuning Valve (MTV) may also be referred to as a MTV solenoid.
The MTV opens a crossover passage that connects both sides of the intake manifold plenum. It is an electric motor. The PCM controls the MTV. The MTV optimizes acoustical tuning of intake system during wide open throttle operation throughout RPM range.