Ford E7PZ-9H473-A Valve Assembly

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Lean mixtures can lead to high combustion temperatures and the production of nitrogen oxides (NOx), which are pollutants.

The amount of exhaust gas reintroduced is dependent on many factors such as engine speed, altitude, manifold vacuum, exhaust system back pressure, coolant temperature, and throttle angle.

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.

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

Common issues that may require troubleshooting in the emission control system include driveability issues, failed smog certifications, or illuminated indicator lights.

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.