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Home >> Ford >> 1988 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> Operation >> THERMACTOR Idle Vacuum (TIV) Valve

THERMACTOR Idle Vacuum (TIV) Valve

TIV valve vents vacuum signal to atmosphere when preset manifold vacuum or pressure is exceeded. It is used to divert air supply during extended idle conditions to limit exhaust temperature.