Genuine Mercury Grand Marquis PCV Valve

Mercury Grand Marquis PCV Valve Parts Questions & Answers

• Valve Assembly
  2L3Z-6A666-AA
  Q: What is the purpose of the Positive Crankcase Ventilation (PCV) system and PCV Valve?

  A: The Positive Crankcase Ventilation (PCV) system reduces emissions by circulating fresh air from the air cleaner through the crankcase, mixing with gases, and rerouting through a PCV valve to the intake manifold. The system includes a PCV valve, a fresh air inlet, and vacuum hoses. The PCV valve restricts flow to maintain idle quality. If anything odd occurs, the system allows excess gases to flow back into the air cleaner. It is required that regular checking and replacement of the PCV valve happens.