As your vehicle engine is running the combustion gases are collected in the crankcase. These blowby gases contain harmful gases like hydrocarbons, carbon dioxide and water vapor. To prevent escape of these gases to the atmosphere the crankcase is sealed. But if the water vapor is left in the crankcase it can lead to sludge formation thus a sort of ventilation system is needed, the Positive Crankcase Ventilation (PCV) system. The PCV valve is a component of the PCV system and located in the valve cover which routes unburned crankcase blowby gases back into the intake manifold where they can be burned again with the regular fuel. When the engine is at rest the valve is kept closed by spring action. When the engine is running, the low vacuum it creates opens the valve to release the crankcase gases and vapors to the intake manifold for burning. If you are slowing down or the engine is idling, the intake manifold vacuum rises and pulls the valve plunger into the valve opening which partially blocks the opening so that only a small amount of crankcase gas and vapor is released or drawn into the intake manifold. In case of backfire, the spring closes the valve completely so there is no chance that the flame can move into the crankcase and cause an explosion. It totally eliminates crankcase emissions as a source of air pollution and helps remove moisture which can cause sludge to form. If you need a new Dodge PCV Valve, visit our online auto parts store where we have a complete listing of all your auto parts needs. All auto parts that we offer are made from the best quality materials and have passed stringent quality control tests to ensure reliability and durability. We also have an efficient customer service team who willingly help you out.