Operation CHARM
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Pontiac
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2000
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Firefly (CANADA) L4-1.3L
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Description and Operation
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Crankcase Ventilation System Description
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Operation
Operation
The primary control of engine crankcase blowby gas is the PCV valve. The PCV valve meters the flow of blowby gas according to the manifold vacuum signal.