Which outcome results when a gasoline direct injection engine experiences excessive carbon buildup on piston crowns?

💡 Explanation

When excessive carbon builds up on piston crowns, the deposits act as insulators and heat local "hot spots", increasing the likelihood of auto-ignition before the timed spark because it raises combustion temperature. Therefore, increased engine knocking results, rather than reduced oil, high temperature, or reduced efficiency, each reliant on distinct failures.

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