The PCV Valve of the Nissan Armada facilitates the return of partially burned crankcase gases to the combustion chambers to promote cleaner engine operation and help the engine work better. The valve makes use of the vacuum that the intake manifold develops. At idle when the vacuum level is high, the valve restricts the flow through it. At higher speed or load, when the vacuum level drops, the valve opens wider. This allows more blow-by from the crankcase. Simultaneously, it slows down the evolution of toxic substances that would emit from the crankcase if the valve were permanently open. The PCV Valve is a spring-loaded valve that acts as a flame arrester and prevents reverse pressure pulses from entering the crankcase. The component helps maintain the oil condition as well as stable compression by constantly ventilating the lower engine and preventing sludge formation. The PCV Valve in the Armada engine bay is a compact unit based on the original Nissan design and sits opposite the crankcase breather to allow balanced gas circulation. Regular checks ensure the PCV Valve is free and functioning. This simple but important element featured in all Nissan powertrains shows any Armada driver that the Armada engine meets Nissan's emission and durability standards. Basically, the function of the PCV Valve decreases emissions.
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