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The PCV valve was the first of the emission system components to be put into production vehicles. They recirculate gasoline and oil film impregnated air from inside the engine block into the air intake system after the throttle bodies. This air is combined with fresh air entering the air intake system to be then burned in the combustion chamber. Although the PCV valve is a simple device, it is designed to reduce the air pressure inside the engine and redirect it to the air intake system. Since the air is contaminated with oil and gasoline, this does in time affect the operation of the valve assembly. The valve will plug up over time, which can result in a poor running engine that delivers less power, or fuel economy. The PCV valve may fail in either a closed or open position, usually due to clogging with oil sludge or dirt. Failing in the open position causes hard starting and rough, low speed running. Failure in the closed position causes buildup of crankcase pressure, which can force engine oil past seals, gaskets and other openings in the crankcase. PCV valve threads into the intake manifold and is connected by a rubber hose and metal tube to the crankcase. Removed one end of the U-shape hose "clamp", pull out the hose from the PCV. If it does not work use vise-grip to hold old PCV valve while twisting and pulling the hose. |
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