Function And Operation Principle

Variable Intake Solenoid (VIS) Valve is installed on the intake manifold and is used to improve intake efficiency.

1. Low/Middle Speed: VIS Valve Close → Resonation Effect → Improving Intake Efficiency
2. High Speed: VIS Valve Open → Improving Intake Inertia Effect → Improving Intake Efficiency
   Fig 1: Identifying Variable Intake Solenoid (VIS) Valve

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 2: Variable Intake Solenoid (VIS) Valve In Open And Closing Positions

   Courtesy of KIA MOTORS AMERICA, INC.