Nissan 14958-V6700 Valve Assembly Vacuum Delay

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The EGR system works to lower down the NOx production through the circulation of some portion of the exhaust gases to the intake manifold, so as to minimize the combustion temperature. These are EGR valve, an EGR Control solenoid valve, an EGR Temperature sensor, and an EGR Control Backpressure Transducer. It is controlled by PCM; the EGR solenoid is opened through the vacuum system that is connected to the intake air after the throttle valve. The back pressure transducer, has the function of measuring the exhaust back pressure to control the EGR vacuum signal The temperature sensor has the function of updating the PCM on the changes in the EGR passageway. To do this, examine the hoses for signs of wear or improper connection, and moving the EGR valve by bringing the engine to the warm up and acting on the throttle. If the valve does not move, one should look at vacuum signal and the connection. For the component checks, apply vacuum to the EGR valve to check it opens and holds and check for deposit level to decide if cleaning is required. Thus, the solenoid has to be checked for vacuum presence and battery voltage and the leakage of the backpressure transducer. It is expected that the resistance of the temperature sensor should drop as the temperature goes up. As for replacements, one should remove the certain elements, decontaminate the skin to avoid blockage, and then install new elements properly.

Make possible an interval during which the EGR control valve and its adjacent accessories can cool. Detach the EGR vacuum hose. The EGR inlet pipe should be taken out of the EGR control valve. Remove the two retaining nuts and raise the control valve from the studs. Reverse above mentioned removal procedures for installation after cleaning gasket mounting surfaces and installing new gaskets. Note: when installing EGR guide tube ensure it faces its outlet towards the back of the engine or else there will be reduced distribution efficiency of exhaust gas.

The EGR system includes components such as the EGR valve, EGR control solenoid valve, EGR temperature sensor, and EGR control backpressure transducer valve.

To determine the condition of the EGR valve, you can compare the free movement of your EGR valve with a new valve.

Reach under the EGR valve and push up on the diaphragm; using moderate pressure, you should be able to press the diaphragm up and down within the housing.

The EGR system is designed to reduce NOx emissions by recirculating a portion of exhaust gases into the intake manifold, which lowers combustion temperatures and reduces the formation of NOx compounds.

Open the hood and locate the EGR valve at the right rear of the engine.