Exhaust Gas Recirculation: Description and Operation

Maxima, Pathfinder, Van & 300ZX; 1987-88 Pickup, Stanza, Stanza Wagon & 200SX; 1987-88 Pulsar Exc. E16i Engine

In the EGR system, a portion of the exhaust gas returns to the combustion chamber to lower flame temperature during combustion. When the EGR control valve is open, a portion of the exhaust gas travels from the exhaust manifold to the EGR tube. The exhaust gas is then regulated by the EGR valve and routed to the intake manifold. On Maxima and 300ZX models, the signal from the electronic control unit is sent to the EGR control solenoid valve which stops EGR operation during engine start, when throttle valve switch is on, when engine is cold or very hot, when engine speed is below 900 RPM or above 3200 RPM on 1985 models or when engine speed is above 2700 RPM on 1986-88 models. On Pulsar, Stanza and 200SX models, the signal from the electronic control unit is sent to the EGR control solenoid valve which cuts the vacuum line for the BPT valve.