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8. Their relationship towards the person that they are looking to persuade The black exhaust Black is apparently a depressing color. The reason ought to be rich mixture. That is to say, the mixture of gas in cylinder component is at night normal level. The incomplete combustion gas inside the combustion chamber make the carbon particle exhausted with the waste gas. Failure probably will come from the following reason: The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions.