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JA
EXHAUST GAS RECIRCULATION SYSTEM
DESCRIPTION AND OPERATION
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM—UNLEADED FUEL
SYSTEMS ONLY . . . . . . . . . . . . . . . . . . . . . . . . 7
DESCRIPTION AND OPERATION
EXHAUST GAS RECIRCULATION (EGR) SYSTEM—
UNLEADED FUEL SYSTEMS ONLY
Vehicles with fuel systems calibrated to run on
leaded fuel do not use Exhaust Gas Recirculation.
Refer to Monitored Systems - EGR Monitor in this
group for more information.
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 mix-
ture reduces peak flame temperature during combus-
tion.
The EGR system consists of (Fig. 1), and (Fig. 2):
• EGR tube
• EGR valve
• Electric EGR Transducer
• Connecting hoses
EMISSION CONTROL SYSTEMS
INDEX
page
Fig. 1 EGR Control Valve—2.5L
Fig. 2 EGR Valve—2.5L
25 - 7
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