Grand Caravan FWD V6-3.3L VIN 3 Flex Fuel (2002)
EGR Valve: Description and Operation
Fig. 2 EGR Valve And Tube 3.3/3.8L
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. See: Computers and Control Systems/Description and Operation
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.
