Category Archives: EGR Valve

EGR Valve

It is pretty amazing how auto makers have been able to consistently build more powerful engines in vehicles that get better fuel economy while at the same time meeting increasing environmental standards.  One of the little miracles that helps make this happen is the Exhaust Gas Recirculation (EGR) Valve.  The EGR valve routes some exhaust back into the air intake system in both gasoline and diesel engines.  The exhaust gas takes up some space in the engine cylinders, replacing some of the oxygen-rich air that would otherwise be in there.  This means that the fuel burning event is cooler.  Cooler combustion means fewer harmful nitrous oxides are produced. Your EGR valve can get gummed up, messing the timing and amount of exhaust that is supposed to be recirculated in the engine.  Symptoms of EGR valve problems are rough idle and poor engine performance.  Performance can be restored by cleaning or replacing the EGR valve, depending on how dirty it is ... read more

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EGR Valve