XJ-S Convertible (XJ27) L6-4.0L (1996)
EGR Valve: Description and Operation
Exhaust Gas Recirculation System (North American NA Models Only)
The exhaust gas recirculation (EGR) system helps to control the nitrous oxide (NOx) content of the exhaust emissions. It does this by directing a
proportion of the exhaust gasses back to the engine intake manifold, which results in a reduction of combustion temperatures and NOx emissions.
The EGR system consists of an EGR valve, an EGR valve function sensor and a transfer pipe.
EGR Valve
The vacuum operated EGR valve used in previous systems is replaced by an electrical valve to enable mapped control of valve opening by the engine
control module (ECM). The new EGR valve is a variable position pintle valve, installed on the intake manifold. In the de-energized condition the
pintle extends to the closed position. In the energized condition the pintle retracts to the open position. A pintle position sensor in the EGR valve
supplies a feed-back signal to the ECM, for closed loop control.
EGR Valve Function Sensor
The EGR valve function sensor is a thermistor, which is connected to the ECM. The sensor is installed on the intake manifold adjacent to the EGR
valve.
Transfer Pipe