Exhaust Gas Recirculation: Description and Operation

EGR System Overview Schematic:

EGR is introduced on the supercharged engine of XJR Sedans. The system is essentially the same as on the normally aspirated AJ16, but with revised installation.

EGR Valve:

The EGR valve is located on a casting attached to the exhaust manifold.

Function Sensor:

The EGR valve function sensor and the transfer pipe outlet are connected to an adapter block on the throttle body adapter.

Transfer Pipe:

To protect the starter motor cable, a heat shield is installed on the upper mounting stud of the starter motor. In addition, a protective sleeve is installed on the starter motor cable between the starter motor and the first cable clip on the transmission housing. The transfer pipe is secured in a clip on the heat shield.

The Exhaust Gas Recirculation (EGR) Valve, when activated by the ECM, allows exhaust gas to enter the intake air stream to dilute the oxygen content of the combustible fuel/air mixture, so lowering combustion temperatures and consequently Nitrous Oxide emissions. The temperature of the introduced gases is monitored by the adjacent EGR function sensor.