The intake manifold uses dual length intake runners. The round "widget" on the back of the manifold is a vacuum motor that operates the linkage that operates the induction valves inside the manifold. The vacuum motor is controlled by the Variable Intake Manifold (VIM) solenoid. The VIM solenoid has +12 VDC supplied to one side of the coil, the ECM grounds the other side of the coil to energize the solenoid (ON). When the engine RPM is less than 3600 , the VIM solenoid is “ON” and when the engine RPM is more than 3600, the VIM solenoid is “”OFF”. The induction control valves are closed when the VIM solenoid is “ON”, and opened at the VIM solenoid is “OFF”. The hose from the vacuum motor is attached to the VIM solenoid as shown in the attached image.
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02 Rodeo Sport 4X4 3.2L V6 73K miles
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