Which risk increases when direct fuel injectors experience excessive carbon buildup on the nozzle in gasoline engine?

💡 Explanation

When carbon buildup occurs, the spray pattern from the injector becomes inconsistent because partial blockage disrupts the homogeneous air-fuel mixture, leading to localized lean pockets and hot spots that promote detonation. Therefore detonation is the increased risk, rather than pre-ignition, hydraulic lock, or cylinder wall scoring which involve different mechanisms.

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