Acura 17130-PY3-003 Pcv Valve Assembly

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The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors, circulating fresh air from the air intake duct into the crankcase, where it mixes with blow-by gases before being drawn by intake manifold vacuum through a PCV valve to the intake manifold. The PCV valve maintains idle quality by regulating the flow of crankcase vapors based on intake manifold vacuum levels. In 1999 models, the PCV fresh air inlet hose connects the air intake duct to a pipe on the left end of the front valve cover, while the crankcase ventilation hose connects a pipe on the left end of the rear valve cover to a pipe on the intake manifold. For 2000 through 2003 models, the configuration remains similar, but the crankcase ventilation hose runs along the top of the rear valve cover and connects to a pipe at the right rear corner of the intake manifold plenum, requiring removal of the intake manifold cover for access. In 2004 and later models, the fresh air inlet hose connects to a pipe on the left end of the rear valve cover, and the crankcase ventilation hose connects a pipe on the right end of the front valve cover to another pipe on the right end of the intake manifold, necessitating removal of the engine cover for access. To check the system on 2000 through 2006 models, the intake manifold cover must be removed, while for 2007 and later models, the engine cover is removed. The hoses should be inspected for damage, and the engine should be warmed up for testing. For 2003 and earlier models, the PCV valve can be tested by covering its open end while idling, while for 2004 and later models, pinching the PCV hose should produce a clicking sound from the valve. If issues are found, the PCV valve and hoses may need to be replaced, with specific steps for removal and installation outlined for different model years, including the need to replace O-rings and ensure proper torque during reassembly.

The PCV system plays a crucial role in reducing hydrocarbon emissions by directing fresh air from the air intake duct into the crankcase, where it mixes with blow-by gases.