Bravada V6-262 4.3L VIN W CPI (1994)
Intake Manifold: Description and Operation
INTAKE MANIFOLD TUNING VALVE ASSEMBLY
The diagnosis of the tuning valve circuit can be found in Testing and Inspection. See: Testing and Inspection
The tuning valve (rotary solenoid device) is electrically controlled by the control module based on RPM and TP signal inputs, for accurate switching
capability at optimum switching points to enable either a "split" or "single" plenum condition.
During the low and high end of the RPM range, the control module de-energizes the valve and enables a "split" plenum condition that provides for
peak torque along with increased peak horsepower.
During the mid RPM range, the control module energizes the valve, thus enabling a "single" tuning plenum conditionn that provides for mid RPM
range peak torque.
