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Home >> Chevrolet >> 1977 >> Luv Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Catalytic Converters >> Testing >> Vacuum Switching Valve

Vacuum Switching Valve

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With valve removed from vehicle, apply 12 volts to connector terminals and listen for clicking of solenoid as it moves inside valve. If no clicking is heard, select a new valve and repeat check.