Question about 2004 Nissan Frontier

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Check engine soon light on. EGR code

EGR light on, Bought a EGR valve. what is the prcedure in changing it and are there other things to change or look for?

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  • harold_mccol May 27, 2010

    Engine runs smooth. I changed the EGR valve and they cleaned the ports ect at 70,000 it is 118,000 now.
    Besides the air filter, what else may I take off to try to get in there to take it off? There is no room to get anything in there to pull both lines or the bolts that hold it on.

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Before you unpack the EGR you might be able to save the old one by cleaning it an then collect a refund. The purpose of the EGR is to supply a measure of exhaust gas to the intake mix so that the charge delivered to the engine is reduced in oxygen. This reduces the ignition temperature and prevent nitrous oxide formation in the exhaust. The EGR valve has two ports in it side by side. The one to the exhaust is gated by the valve and the other is connected to the intake. The valve is pulled open by a diaphragm acted on by a vacuum line from the intake manifold. The EGR valve is often monitored and regulated by differential pressure feedback exhaust DPFE sensor that lies upstream on the vacuum line leading to the EGR. If this DPFE fails it will report the same EGR light. Remove your EGR valve and plug the open EGR intake port on the manifold with a cloth and reconnect the vacuum line to the EGR valve. Start the car and now watch the action of the EGR valve. It should seen to open and close depending on engine demand. If it looks badly coked, spray it liberally with carb choke cleaner and wipe with a cloth until everything is polished metal. If the EGR looks good and is obviously working take a long look at the DPFE sensor; DPFE sensors have a reputation for failing many more times more often than the EGR valves they monitor.

Posted on May 27, 2010

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Yes there are other things to look for,check the rubber line coming of the egr to a disc shaped vacuum module(usually above the egr) its called a pressure transducer,that rubber line usually burns through or falls apart,that might be your whole problem,might not even need the egr,start there,hope this helps

Posted on May 27, 2010

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Early Models : The EGR valve control the amount of exhaust gas routed to the intake manifold. Vacuum is applied to the EGR valve in response to the throttle opening. The vacuum control the movement of the taper valve connected to the vacuum diaphragm in the EGR valve.

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Late Models : The EGR volume control valve uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.

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Symptoms
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Possible causes
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Possible solution
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