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http://www.autorized.com/auto-maintenance/what-does-the-pcv-valve-do.shtml In a nutshell, the PCV (Positive Crankcase Ventilation) valve is part of a simple emissions loop that takes crankcase gasses back over to the engine to be burned instead of vented into the atmosphere. This actually has other benefits besides emissions control - it keeps the engine cleaner and makes it more efficient. The actual valve itself is very important because it controls HOW MUCH gas/air flows though at any given time. Too much is bad, too little is bad. The valve is matched to your car's engine.
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