Genuine Mercury Zephyr EGR Valve

Mercury Zephyr EGR Valve Parts Questions & Experts Answers

• Valve Assy - EGR Vacuum Control
  D5FZ-9D473-B
  Q: What is the location and common issue with the EGR valve on Mercury Zephyr?

  A: The EGR valve is located on the intake manifold, adjacent to the carburetor. The majority of the time, when a fault develops in this emissions system it is due to a stuck or corroded EGR valve. With the engine cold to prevent burns, remove the EGR valve. Using moderate pressure, manually push the valve diaphragm up and down within the housing. If the diaphragm does not move or moves only with much effort, replace the EGR valve with a new one. If you are in doubt about the condition of the valve, obtain a new valve and compare the free movement between the two. Further information on EGR system can be found in the related materials.