Genuine Toyota Camry PCV Valve

Toyota Camry PCV Valve Parts Questions & Answers

• Valve Sub-Assy, Ventilation
  12204-28030
  Q: What is the Role and Importance of the Positive Crankcase Ventilation (PCV) System and PCV Valve in Reducing Hydrocarbon Emissions?

  A: The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It circulates fresh air from the air cleaner through the crankcase, mixing it with blow-by gases. The mixture is rerouted through a PCV valve to the intake manifold. The PCV valve restricts flow when intake manifold vacuum is high, maintaining idle quality. In abnormal conditions, excessive blow-by gases flow back through the crankcase vent tube into the air cleaner for normal combustion. The PCV system consists of the PCV valve, blow-by filter, and vacuum hoses connecting these components to the engine. Regularly checking and replacing the PCV valve is important.