- The exhaust gas recirculation valve works by recirculating approximately 10 percent of engine emission gases back into the intake manifold. The EGR valve effectively reduces the amount of emissions put out by the engine and forces the engine to reuse the hydrocarbons not consumed when the fuel was initially burned off by the engine. The EGR valve in the Cavalier works by using a vacuum to draw gases back through the valve and circulate them into the intake manifold.
- The EGR valve reduces the amount of nitrous oxide that your vehicle's engine emits into the air. It also allows the engine to start and run more efficiently by lowering the peak combustion temperature in the engine. A lower combustion temperature prevents a certain amount of the nitrous oxide from forming, because nitrous oxide forms at high temperatures.
- EGR valve problems have been known to occur when carbon deposits build up on the inside of the valve and cause the valve to become stuck open or closed, affecting airflow. These problems can cause your Cavalier to idle rough, idle inconsistently or stall. Carbon deposits in the EGR valve will cause your Cavalier's check engine light to come on.
- The 2004 Cavalier's EGR valve is attached to its intake manifold on the top of the engine. The EGR valve is a small, cylindrical device that is bolted to the manifold.
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