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The black exhaust Black appears to be 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 combustion chamber cause the carbon particle exhausted with all the waste gas. Failure is likely to come from the following reason: 5. The power of their language The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions.