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Combination throttle control PCV Valve in Ford Explorer Sport Trac vehicle is used in controlling emission and boosting performance of the vehicle. The PCV valve helps protect the environment and the engine itself from the buildup of dangerous oil sludge; it does so by directing crankcase combustion byproduct gases back into the Engine's combustion chamber. Depending on intake manifold vacuum conditions, the PCV Valve partially closes and does not allow much gas flow at idle but this can cause lean running of the engine; at higher RPM or under load the PCV Valve opens fully to allow increased blow-by gases. Also, the PCV Valve plays a role in a flame arrester and also helps in enhancing the compression of the engine. It is recommended that the PCV Valve should be checked and serviced on a regular basis in order to avoid some of the problems like contaminated engine oil, oil leakage, and high fuel consumption.