F 150 4WD Pickup V8-281 4.6L VIN W EFI (1997)
Intake Manifold Tuning Valve (IMTV): Description and Operation
PURPOSE
The Intake Manifold Tuning (IMT) valve assembly increases mid-range torque of the engine.
CONFIGURATION
The IMT valve is a single valve that blends the air flow of a dual plenum type intake manifold. The IMT Valve assembly is a two-position valve
located in the intake manifold. The MT Valve is normally closed at low engine speeds and provides torque improvements by separating intake pulses
of a dual plenum system.
Intake Manifold Tuning Valve (IMTV)
OPERATION
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The PCM uses the Throttle Position (TP) sensor and rpm input signals to determine activation of the Intake Manifold Tuning Valve system. Below
approximately 3000 rpm, the IMT valve shutter is closed, and above approximately 3000 rpm, the shutter is opened. There must be a positive
change in voltage from the TP sensor along with the increase in rpm to open the shutter.
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The PCM uses the information from the input signals to control the IMT valve based upon rpm and changes in throttle position.
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When commanded on by the PCM, the valve opens up the end of the vertical separating wall at high speeds to allow both sides of the manifold to
blend together to provide air flow tuning on the dual plenum system.
