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Ford Truck
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1998
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F 150 4WD Pickup V8-5.4L Prop SOHC VIN Z
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Positive Crankcase Ventilation
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Positive Crankcase Ventilation Valve
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Description and Operation
Positive Crankcase Ventilation Valve: Description and Operation
The PCV valve:
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controls the amount of ventilating air and blow-by gases going to the intake manifold.
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prevents backfire from reaching the crankcase.