Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description And Operation: Description
Variable Intake manifold Solenoid (VIS) valves are installed on the intake manifold (VIS Valve 1) and the surge tank (VIS Valve 2). These VIS valve 1 and 2 control vacuum modulators which activate valves in the intake manifold and the surge tank. These valves are opened or closed by ECM according to engine condition (Refer to below chart).
| Engine Condition | VIS Valve #1 (In-manifold) | VIS Valve #2 (Surge Tank) |
|---|---|---|
| Low Speed | Open | Open |
| Medium Speed | Close | Close |
| High Speed | Close | Open |
| High End Speed | Open | Open |
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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