Function And Operation Principle

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

Fig 1: Identifying VIS Valve Location

Courtesy of HYUNDAI MOTOR CO.

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 2: Identifying VIS Valve Open And Close Position

   Courtesy of HYUNDAI MOTOR CO.