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Home >> Saturn >> 2001 >> SW2 L4-1.9L DOHC VIN 7 >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Positive Crankcase Ventilation >> Description and Operation >> Theory of Operation >> During Deceleration, Low Speed, and Idle
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During Deceleration, Low Speed, and Idle

During engine deceleration and idle, manifold vacuum is high. The high vacuum overcomes the force of the PCV valve spring, and the valve bottoms in the manifold end of the valve housing. This does not completely stop the flow of crankcase vapors into the intake manifold, but it does restrict them to a specified value for each engine.
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