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.
Except Federal Models
The vacuum switching valve (VSV) has 3 ports, 2 of which are opened or closed by a solenoid plunger. Solenoid plunger is energized when coolant temperature is under 122°F (50°C) or for 10 seconds after WOT switch is turned on (coolant temperature over 122°F).
The VSV reverses the application of manifold vacuum to the air switching valve. When energized, the VSV connects chamber "B" of air switching valve to intake manifold. When plunger is de-energized, it plugs chamber "B" and connects chamber "A" of air switching valve to intake manifold.
NO RELATED
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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.