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EGR stands for exhaust gas recirculation. The valve recirculates already burnt exhaust into the intake to lower the combustion temperatures to reduct the nox emissions. The main problem with this is that soot coates the intake passages and the fuel does not burn as efficiently. Take your crossover pipe off and look into it.
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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K
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