Pontiac Firebird EGR Valve & Parts

The EGR valve in an automobile connects the exhaust pipes and the intake manifold of an engine. The EGR valve regulates the flow of exhaust gas into the intake manifold. EGR valves are of different types, including single or twin-diaphragm versions that come with position feedback or temperature sensor. They are controlled by an electrical connection. The position feedback uses a potentiometer, which is mounted on the EGR valve and sends the signals and position of the EGR valve to the ECU. It also keeps track of the percentage of EGR recirculation across different loads.

The EGR system is used to reduce the oxygen content in the combustion process by recirculating inert exhaust gas into the air/fuel mixture at the intake manifold. This leads to a slower explosion in the cylinder and lower combustion temperature and pressure. NOx (nitrogen oxides) are formed at higher temperatures, therefore, the EGR system is used to reduce the concentrations of NOx in the exhaust gases. For the recirculation of the exhaust gas back into the intake manifold, there is a narrow passageway between the intake manifold and the exhaust manifold. This is where the exhaust gas recirculation (EGR) valve is mounted. This valve regulates the amount of exhaust gas to be recirculated. A precise amount of exhaust gas is recirculated into the engine to maintain the proper operation of the engine. Just 5 to 10% of the overall exhaust gas is returned to the intake manifold. This is sufficient to dilute the mixture of air and fuel in order to have a cooling effect on the combustion temperature of the engine. This holds combustion temperatures below 1500 degrees Celsius to reduce the reaction between nitrogen and oxygen that helps in the formation of NOx. As the engine idles, the EGR valve shuts, leaving no exhaust gas flow back into the intake manifold. Until the engine warms and works under load, the EGR valve remains closed. The EGR valve opens and circulates the exhaust gas to the intake manifold as the load and combustion temperature rise. Old EGR systems use vacuum controlled EGR valves while the new models have an electronic EGR valve to control exhaust gas recirculation.

The EGR (exhaust gas recirculation) is located between the exhaust and intake manifolds. It recirculates the exhaust gases back into the intake manifold. A small pipe comes out of the exhaust and goes into the intake manifold next to the throttle body.

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