Mercury E9PZ-9H473-D Valve Assembly

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It was discontinued due to its inability to conform to tighter emissions standards.

Yes, in fuel-injected systems, additional checks include evaluating the Exhaust Valve Regulator (EVR) solenoid and examining the Exhaust Valve Position (EVP) sensor circuit.

The Exhaust Gas Recirculation (EGR) system is designed to lower combustion temperatures and reduce the formation of Oxides of Nitrogen (NOx) by reintroducing exhaust gases into the combustion chambers. The amount of reintroduced exhaust gas is determined by various factors, including engine speed, vacuum, exhaust backpressure, coolant temperature, and throttle position. EGR valves are vacuum-operated, with the specific vacuum diagram provided on the Vehicle Emission Control Information (VECI) label. The EGR system can be a Pressure Feedback EGR (PFE) or Differential PFE (DPFE) system controlled by the Powertrain Control Module (PCM), comprising the PFE or DPFE sensor (also known as the backpressure transducer), EGR Vacuum Regulator (EVR) solenoid, EGR valve, and associated hoses. To ensure system integrity, inspect hoses, connections, valve mounting, and gaskets for damage. Perform an EGR System Vacuum Test to check vacuum levels, and if it exceeds specifications, investigate the EVR solenoid. Test the EVR solenoid for air flow and functionality, and if necessary, replace it. To assess the EGR valve's operation, monitor idle speed with the IAC solenoid disconnected and apply vacuum to the EGR valve; if idle speed drops significantly, the EGR valve is functional. If not, inspect for blockages or replace the valve. For removal and installation of components, disconnect the negative battery cable, detach wiring harness connectors, hoses, and mounting fasteners as applicable, and replace gaskets when reinstalling components.

To maintain the EGR valve for vehicles with EEGR, you should unplug the electrical connector from the EGR valve position sensor, unscrew the threaded fitting for the external exhaust supply tube (if present), remove the vacuum line and mounting bolts, detach the valve, and replace the gasket. If replacing the EGR valve without the position sensor, transfer the sensor to the new valve with a new O-ring.

To maintain the EGRC or EGRV Solenoid, disconnect the battery, locate the solenoid(s) on the firewall, unplug the electrical connector, label and detach vacuum hoses, and remove the solenoid(s) by unscrewing the bracket screws.

The self-check function monitors the EGR system during operation and generates Diagnostic Trouble Codes (DTCs) for diagnosis.

The operation of the EGR valve is controlled by a vacuum-activated diaphragm built into the valve.

The process for replacing the EGR tube is as follows: a) Prior to removal, remove the EGR valve. b) Disconnect the EGR tube fittings. c) Remove the tube. d) Reinstall the tube.

The EGA flow rate is determined by monitoring the pressure across a fixed metering orifice. The two main types of EGR systems mentioned are the Pressure Feedback (PFE) system and the Differential Pressure Feedback (DPFE) system.