Which outcome results when excessive unburned fuel accumulates in a diesel engine exhaust system containing a catalytic converter?

💡 Explanation

When unburned fuel accumulates, catalytic oxidation occurs within the converter because the catalyst accelerates the reaction, releasing significant heat and potentially leading to uncontrolled temperature increases and damage. Therefore, catalyst overheating and thermal runaway results, rather than increased NOx, misfires, or reduced particulate matter which require drastically different conditions.

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