Variable Induction System: Description and Operation

Variable Induction Control Servo Location (Non Turbocharged):

Variable Induction Control Valve, Shaft Location:

The variable induction control servo is a computer controlled, solenoid operated, vacuum shut-off valve located on the firewall. Two air intake paths are provided in the intake manifold to allow the selection of the intake path most favorable for a given engine speed.
Satisfactory power performance is achieved by computer controlled positioning of the variable induction control valve. High torque at low rpm is achieved when the valve is closed (creating a longer intake path). Higher power at high rpm (above 5,000 rpm) is achieved by opening the induction control valve (creating a shorter intake path). For a more detailed description of the function of the variable induction control servo, refer to Computers and Control Systems.