Exhaust Gas Recirculation: Description and Operation

VALVE
The EGR system consists of:
- EGR tube (connects a passage in the intake manifold to the exhaust port in the cylinder head)
- EGR valve
- Electronic EGR Transducer
- Connecting hoses

Refer to Monitored Systems - EGR Monitor for more information.

The engines use Exhaust Gas Recirculation (EGR) systems. The EGR system reduces oxides of nitrogen (NOx) in engine exhaust and helps prevent detonation (engine knock). Under normal operating conditions, engine cylinder temperature can reach more than 3000 °F. Formation of NOx increases proportionally with combustion temperature. To reduce the emission of these oxides, the cylinder temperature must be lowered. The system allows a predetermined amount of hot exhaust gas to recirculate and dilute the incoming air/fuel mixture. The diluted air/fuel mixture reduces peak flame temperature during combustion.

Fig. 3 EGR Valve And Transducer - Typical:

The electric EGR transducer contains an electrically operated solenoid and a back-pressure transducer. The Powertrain Control Module (PCM) operates the solenoid. The PCM determines when to energize the solenoid. Exhaust system back-pressure controls the transducer.

A failed or malfunctioning EGR system can cause engine spark knock, sags or hesitation, rough idle, engine stalling and increased emissions.