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PCV is and acronym for Positive Crankcase Ventilation. It is part of a system that helps control air pollution by burning fumes that collect in the engine crankcase instead of venting them to the atmosphere.
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Is the vent from the pcv valve back into the air intake really needed?
After working on my car, I didn't bother to reattached the line from the pcv valve into the air intake before testing the motor. It ran normally. This made me question whether I need to even return it …