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 (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.
[The operation section of VIS valve]
| VIS Valve | Air Passage | Effect |
|---|---|---|
| Open | Short Runner | Improvement in power |
| Close | Long Runner | Improvement in Low/Middle speed torque |
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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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