Cars & Vehicles
Crankcases and PCV Valves
Chevy Suburban
Toyota SR5

What does a PCV valve do?

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Wiki User
January 17, 2011 12:12AM


PCV Positive Crankcase Ventalation. Takes the blowby, gas, fumes out of the crankcase and reburns it by pulling it into the intake side and in the event of a backfire it closes off the path by means of a check valve.