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Ford Truck
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1998
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F 150 2WD Pickup V8-5.4L CNG VIN M
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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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Description and Operation
Positive Crankcase Ventilation: Description and Operation
The PCV system uses intake manifold vacuum to ventilate the crankcase and return the fumes to the intake manifold for combustion.