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 Manifold Valve & Connector

Courtesy of KIA MOTORS AMERICA, INC.

[The operation section of VIS valve]

Fig 2: Engine Load & Engine Speed Graph

Courtesy of KIA MOTORS AMERICA, INC.

AIR PASSAGE DESCRIPTION

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

Fig 3: Identifying Intake Runner Air Paths

Courtesy of KIA MOTORS AMERICA, INC.