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Home >> Buick >> 1980 >> Skyhawk Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Transmission Controlled Spark System >> Operation >> Solenoid Valve
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Solenoid Valve

The solenoid valve is normally open, but stops vacuum flow through it when it is energized by an electrical signal. When the solenoid is closed, a vent bleeds off vacuum.