Mercury E9PZ-9H473-D Valve Assembly

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NOx formation is reduced and combustion temperatures are lowered by the EGR system through reintroduction of exhaust gases into the combustion chambers. Engine speed, vacuum, exhaust backpressure, coolant temperature, and throttle position are some of the factors that determine how much exhaust gas is reintroduced. The EGR valves are vacuum-operated and a vacuum diagram is supplied on the VECI label. The PCM can be used to control PFE or DPFE systems consisting of hoses, EVR solenoid, EGR valve, and either PFE or DPFE sensor. Look for damages on gaskets, hose connections, and valve mounting among others. Check whether there is an intermittent connection in the electrical connector to the EVP sensor. If so, replace it. For a diagnosis of poor engine performance related to EGR system concerns permit access to scan tool data and perform self-tests on all systems with electronically controlled components. Monitor idle speed with the IAC solenoid disconnected while applying a vacuum to the EGR valve to assess its operation.

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.

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 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.

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

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.

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.

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