Description & Operation: Description
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
Variable Intake manifold Solenoid (VIS) valve is installed on the intake manifold. The VIS valve controls the vacuum modulator which activates a valve in the intake manifold. The ECM opens or closes this valve according to engine condition (Refer to below table).
| Engine condition | VIS valve | Operation |
|---|---|---|
| Medium speed | Closed | Increasing engine performance in low engine speed by reducing intake interference among cylinders |
| Low/High speed | Open | Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance |