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Home >> Jeep >> 1981 >> Cherokee Base, 2D Utility, 4.2L Eng VIN C, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computerized Emission Control >> Operation >> Data Sensors >> Open Loop 4 (OL4) Vacuum Switch
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Open Loop 4 (OL4) Vacuum Switch

This switch is mounted on same bracket as the AVS switch and is controlled by manifold vacuum. This switch is normally open. When open, the switch indicates a near full throttle condition.