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EGR stands for exhaust gas recirculation valve. it is used as a polution control device to lower the Nox in the burnt fuel. If you are getting soot in the egr valve, you might also be getting soot out of the exhaust pipe and your car is most likely running VERY rich (Rich meaning that you have too much fuel in your fuel air mixture. Lean is when you have too little fuel in the fuel air mixture)

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17y ago

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