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EGR does NOT change mixture or Lambda
before someone chimes in and states or asks the question
let me say that the presence of the INert gas does not change the air fuel ratio , the EGR exhaust gas added is INert , the air fuel ratio is UNchanged by the dilution of INert gas .
EGR does not , and can not make the mixture leaner or richer .
there is no usable fuel and no usable 02 in INert exhaust gases present in EGR.
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