Lincoln F37Z-9D475-C Valve - Exhaust Gas Recirculation

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For fuel economy purposes designers make adjustments to air/fuel ratios in cruise mode. When people mix lean, the combustion temperatures become high and generate pollutants like NOx. To control NOx during lean cruise modes, the EGR system reintroduces small quantities of exhaust gas into the intake manifold. It is the EGR valve that joins the exhaust system to the intake manifold, which is controlled by a vacuum-activated diaphragm. The F-series and Bronco vehicles have three different types of EGR systems, conventional ported vacuum, integral backpressure valve, and Electronic EGR (EEGR) system. The early non-U.S models used ported vacuum valves while early U.S carbureted models used integral backpressure valves.

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 ported vacuum EGR valve, integral back pressure transducer valve (BP), and electronic EGR (EEGR) function differently. The BP valve modulates EGR flow based on ported vacuum and exhaust back pressure, while the EEGR utilizes an electronic EGR valve controlled by a position sensor, with the PCM adjusting the valve position for optimal flow.

The EVR can be tested for voltage and resistance, and the DPFE sensor can be checked for signal voltage. Additionally, the EGR valve, EGR vacuum regulator, and DPFE sensor can be removed and replaced following the appropriate steps if necessary for component replacement.

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.

Replacements of other components related to the air inlet control, deceleration throttle control, intake manifold heating, PCV system, and catalytic converter typically involve disconnecting wires and hoses, removing faulty components, and installing new ones as needed.

The 6.4L diesel engine features a two-cooler EGR system, with the EGR valve located on top of the engine. It fits into a hole in the intake tract, sealed by an O-ring, and is attached with three bolts.

Potential replacements include the EGR valve, EGR vacuum regulator, and DPFE sensor. Safety precautions and protective gear are emphasized during EGR valve and passage cleaning to prevent damage.

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.

Trouble codes can indicate issues with the EGR system. For example, too much EGR flow can cause rough running or engine stalling, while too little or no EGR flow can lead to high combustion temperatures and issues like spark knock or emission test failure.

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.

To replace the EGR tube, you need to follow these steps:1. Remove the EGR valve.2. Disconnect the tube fittings.3. Installation is the reverse of removal.