Mercury E7PZ-9H473-B Valve Assembly

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Checks for ported valves, integral back pressure transducer valve, and electronic EGR valves involve vacuum testing, leakage tests, functional tests, and resistance measurements.

The EEGR system is operated in direct response to the EEC PCM computer, which uses its engine sensors and preprogrammed routines to determine the optimum duty cycles in concert with engine operating conditions and other emission control devices, to minimize pollutants and maximize driveability.

The EGR system accomplishes its purpose by recirculating a small portion of inert exhaust gases into the intake manifold. This lowers the combustion temperature and mitigates the formation of NOx compounds.

The purpose of the emission control system is to regulate exhaust gas recirculation (EGR) in vehicles with carbureted and fuel-injected engines.

The EGR system reintroduces small metered amounts of exhaust gas back into the intake manifold during part throttle and cruise conditions, where it combines with the air/fuel mixture before combustion, lowering combustion temperatures and reducing NOx emissions.

The PFE system relies on downstream pressure for EGR control, while the DPFE system monitors both upstream and downstream pressures for more precise control.

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 perform maintenance on the EVP sensor, located on the EGR valve, unplug the electrical connector, remove the three mounting bolts, and detach the sensor. Ensure to use a new O-ring during installation.