Exhaust Gas Recirculation (EGR) System — General Description (Opel Vectra A)

The system returns small portions of exhaust gas into the combustion cycle to reduce nitrogen oxides (NOx).

On the C16 NZ, C16 NZ2 and C18 NZ engines, the amount of exhaust gas taken back for reburning is controlled by manifold vacuum via the EGR valve mounted on the intake manifold. When the valve is open, a small amount of exhaust gas is drawn into the intake duct and then into ports in the cylinder head.

On X16 SZ engines, the EGR valve is controlled by a unit mounted on the left side of the engine compartment behind the battery. This unit amplifies the signals received from the fuel system ECU and controls the exhaust gas recirculation valve, providing precise control of exhaust gas combustion depending on the engine operating mode.

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