Which inefficiency results when insufficient fuel vaporization occurs due to low nozzle atomization during direct injection in a modern gasoline engine?

💡 Explanation

Increased unburnt hydrocarbon emissions arise because inadequate vaporization hinders complete combustion via the Leidenfrost effect limiting the surface area of fuel available for reaction; therefore, unburnt fuel is released rather than fully oxidizing, leading to lower combustion efficiency.

• Which outcome results when a turbocharger's wastegate malfunctions and remains closed during high engine load?
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