Nissan 11810-86G00 Positive Crankcase Ventilation Control Valve Assembly

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The crankcase emission control equipment consists of a positive crankcase ventilation valve (PCV), a closed or open oil filler cap and hoses which is meant to contain the gases that are formed in the combustion chamber during engine operation. These gases, if not removed from the crankcase, can get mixed with and contaminate engine oil leading to sludge formation are recirculated back into the engine combustion chamber where they burn up without escaping into the air polluting it. The process of recycling involves clean filtered air being drawn into the crankcase, picking up the combustion gases, and carrying them through the PCV valve and intake manifold to be used in the combustion chamber. This is a very important vacuum controlled valve in this system because it controls how much of these gases are returned to the combustion chamber. When blocked, there will be gas leaks through weak oil seals or gaskets in an engine, thus promoting sludge formation and causing oil leakage. This information along with troubleshooting instructions apply to any engine that has PCV system. To check for any leaks on hoses or connections, examine them for signs of vacuum leakages and replace or tighten as required. With all engines running at idle, disconnect the vent hose from PCV valve. If functioning correctly, there will be a hissing sound as well as strong suction from your mouth when you remove vent hose from PCV valve with your car at idle speed. In order to check for proper operation of this valve you should remove it and then blow through both ends . Air should pass freely through from crank case side but hardly move from intake manifold side . Should this occur , replace such a valve immediately . To remove PCV valve loosen clamp on hose and take off from manifold-crankcase hose as well as intake manifold . Just do installation like removal except disconnecting all hoses then use compressed air to clean them replacing any hose that cannot be blown out by air.

Remove the ventilation hose with the engine idling; if functioning properly, a hissing noise will be heard as air passes through, and a strong vacuum will be felt when placing a finger over the valve opening.