Astro Van L AWD V6-262 4.3L VIN W CPI (1992)
LH Front Side Of Engine
PURPOSE
The tuning valve (rotary solenoid device) is electrically controlled by the ECM based on RPM and TP signal inputs, for accurate switching
capability at optimum switching points to enable either a "split" or "single" plenum condition
OPERATION
During the low and high end of the RPM range, the ECM de-energize 5 the valve and creates a "split" plenum condition that provides for peak
torque along with increased peak horsepower.
During the mid RPM range, the ECM energizes the valve, thus creating a "single" tuning plenum condition that provides for mid RPM range peak
torque.
CONSTRUCTION
The Intake Manifold Tuning assembly consists of:
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ECM
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Intake Manifold Tuning Valve Relay
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Intake Manifold Tuning Valve Solenoid (Assembly)
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Upper and Lower Intake Manifolds