Which outcome results when a diesel engine's cylinder temperature drops significantly below its design point during cold starting?

💡 Explanation

When cylinder temperature decreases substantially, incomplete combustion occurs because the fuel droplets do not fully vaporize and oxidize, increasing the concentration of unburned hydrocarbons in the exhaust. Therefore unburned hydrocarbon emissions increase, rather than pressure increases, reduced NOx, or nozzle fouling, which rely on different conditions and mechanisms.

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