Which outcome increases exhaust NOx levels when gasoline direct injection nozzles experience carbon buildup?

💡 Explanation

When carbon buildup occurs, fuel atomization worsens because effective nozzle orifice is reduced, creating larger droplets, leading to a localized leaner mixture. Therefore, higher combustion temperatures and NOx levels result, rather than cooler temperatures, stratification, or increased EGR, which have opposite effects.

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