EGR Valves
"EGR systems help reduce the level of harmful oxides of nitrogen emissions (NOx) in the exhaust. This type of emission increases with combustion temperature. Although at first impression it may appear counter-productive, the EGR system does this by introducing calibrated amounts of exhaust gas into the engine’s intake system. Since the exhaust gas—for the most part—doesn’t burn, it takes up some of the space in the combustion chamber of the air/fuel mixture. As a result, combustion chamber temperature drops and so do NOx emissions. Signs of a malfunctioning EGR valve or its related components include engine spark knock under acceleration, rough idle, stalling, and reduced power. "
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