Mercury D5FZ-9D473-B Valve Assy - EGR Vacuum Control

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The valves and components in the emission control system control exhaust gas recirculation (EGR) in vehicles. Its operation is based on a ported vacuum, which provides an ideal EGR signal during part-throttle and cruise conditions. BP valve modulates the flow of EGR using ported vacuum and exhaust back pressure. An electronic EGR valve controlled by a position sensor is used for EEGR. Troubleshooting entails dealing with issues affecting drivability, failed smog certifications or warning lights on the dashboard. The self-check function generates Diagnostic Trouble Codes (DTCs) to facilitate diagnosis. Vacuum testing, leakage tests, functional tests, and resistance measurements constitute some of the checks that need to be done on these systems.

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.

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.

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 components include the PFE or DPFE sensor (backpressure transducer), EGR Vacuum Regulator (EVR) solenoid, EGR valve, and associated hoses.

To maintain Thermactor system components like TAB/AIRB or TAD/AIRD solenoid, you should disconnect the battery, locate the solenoid(s) on the firewall, unplug the electrical connector, label and detach vacuum hoses, remove the solenoid/bracket screws, and detach the solenoid(s).

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 three types are conventional ported vacuum, the integral backpressure valve, and the Electronic EGR (EEGR) system.

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