Description and Operation: Description

Variable Intake Manifold (VIS) Valve is installed on the intake manifold. It combines or divides the two banks' intake air passages to improve intake efficiency in accordance with the ECM control signal calculated by engine operating condition.

Fig 1: Identifying Variable Intake Solenoid (VIS) Valve

Courtesy of HYUNDAI MOTOR CO.

[The operation section of VIS valve]

Fig 2: Variable Intake Solenoid (VIS) Valve Operation Graph

Courtesy of HYUNDAI MOTOR CO.

VARIABLE INTAKE SOLENOID VALVE REFERENCE CHART

VIS Valve	Air Passage	Effect
Open	Short Runner	Improvement in power
Close	Long Runner	Improvement in Low/Middle speed torque

Fig 3: Identifying Short Runner And Long Runner Variable Intake Solenoid Valve

Courtesy of HYUNDAI MOTOR CO.