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Z31 EGR Valve

image: EGR Valve (Nissan Factory Service Manual)

The EGR Control Valve controls the volume of exhaust gas led into the intake manifold through a vertical movement of a taper valve connected to a diaphragm that receives vacuum in response to the opening of the throttle. The chart below will explain when the EGR valve is opened.

In the Exhaust Gas Recirculation System, some of the exhaust gas is returned to the combustion chamber to lower the flame temperature during combustion. This results in a reduction of nitrogen oxide (NOx) density in the exhaust gas.

When the EGR Control Valve is open, some of the exhaust gas is led from the exhaust manifold to the EGR tube. The exhaust gas is then regulated by the EGR valve and introduced into the intake manifold.

WARNING - Do this modification at your own risk. We Are not responsable for any issues of your own doing.

Exhaust Gas Recirculation (EGR) System Operation

The signal from the ECCS control unit is sent to the EGR control solenoid valve, which cuts the vacuum line for the EGR control valve when any of the following conditions are met:

| Condition Present | EGR Control Solenoid Position | EGR System Operation | |---|---|---| | Engine Starting | On | Does Not Function | | Throttle Valve Switch Open | || | Low Engine Temperature | || | Engine Speed Below 900 RPM Above 3200 RPM | || | Except Above | Off | Operates |

Diagnosis

image: EGR check procedure (from Nissan Factory Service Manual)

Installation

image: EGR Valve Installation Diagram (Nissan Factory Service Manual)

Installation Tip: When installing the EGR valve and its guide tube, take care to ensure the port is pointing toward the rear of the engine. This positioning is crucial for optimal distribution efficiency of the exhaust gases into the intake manifold.