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

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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 EGA system is aimed at recirculating a small portion of the exhaust gases in the combustion cycle in order to cut the creation of NOx emissions, with the amount and the timing of the ensuing re-circulation prescripts by parameters like engine speed, altitude, manifold vacuum, exhaust system back-pressure, coolant temperature, and the throttle angle. EGR valves, which are vacuum actuated, include three types: They are the ported valve the integral back pressure valve and the last and most complex type is the electronic type. The ported EGR valve works with a vacuum signal from the EGR port and using the position of the tapered pintle or poppet controls the flow. The integral backpressure transducer valve uses backpressure and EGR ported vacuum together, and both are necessary , and is available in a poppet style as well as tapered pintle. The EEC-IV system uses an electronic EGR valve; the flow is monitored by an EGR valve position sensor, and the operation is controlled by an EGR solenoid or an electronic vacuum regulator. For checking the ported valve following should be done: The vacuum line should be in correct position and in good health; there should be no vacuum at the curb idle; there should be vacuum at 3000 rpm. If there is any doubt that the valve might have a leak then a blocking gasket test could be done. For the integral backpressure transducer valve guarantee vacuums lines are well fitted and check on its operation under vacuum, and lack of vacuum at idle position and when cold. If sticking is suspected, the valve should be cycled manually It is also recommended that the manual cycling be done slowly to avoid laden stresses. The electronic valve should be inspected for hose condition and cleanliness of the port where there is leakage test done on it with the aid of a vacuum pump. If the above are not met, the EGR valve, the O-ring or EVP may have to be replaced. For EGR valve replacement, remove the battery cable, disconnect the electrical connector for electric valves, remove the EGR pipe fitting, and unbolt the valve-clean all gasket surfaces and reassemble the new valve in a reverse fashion.

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

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.

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 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).

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.