Which mechanical outcome results when a diesel engine's exhaust gas recirculation (EGR) system malfunctions, leading to increased soot?

💡 Explanation

When the EGR system malfunctions, increased soot accumulates, because less exhaust gas is recirculated reducing the effective intake oxygen concentration, leading to incomplete combustion. Therefore reduced engine volumetric efficiency results, rather than changes in oil viscosity, fuel pressure, or turbocharger boost which are consequences of different engine problems.

• Which outcome reduces catalytic efficiency when reactant concentration saturates enzymatic active sites?
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