Which outcome occurs when lean fuel-air mixtures are utilized with high exhaust gas recirculation (EGR) rates?

💡 Explanation

When lean mixtures are combined with high EGR, incomplete fuel combustion occurs because of locally reduced oxygen availability within pockets, which facilitates the formation of soot, leading to increased particulate matter. Therefore more particulates result, rather than lower temps, knocking, or higher NOx unless lean limits are exceeded.

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