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Which procedure can aid in cooling an overheated engine?

  1. Reduce throttle

  2. Enrich the fuel mixture

  3. Increase RPM

  4. Perform a steep descent

The correct answer is: Enrich the fuel mixture

Enriching the fuel mixture can indeed help in cooling an overheated engine. When the fuel mixture is enriched, there is a higher proportion of fuel relative to air in the combustion process. This additional fuel can absorb more heat, effectively lowering the overall temperature of the engine. Furthermore, the increased fuel flow allows for better cooling through the engine's cooling system, and it also reduces the chances of detonation and pre-ignition, which are both detrimental to engine health. While other procedures like reducing the throttle or performing a steep descent also have cooling effects by decreasing engine workload or increasing airflow around the engine, enriching the fuel mixture specifically addresses the combustion process and offers a more immediate mechanical cooling effect. Increasing RPM, on the other hand, typically increases engine temperatures as it demands more power from the engine. Therefore, enriching the fuel mixture stands out as the most effective immediate measure for cooling an overheated engine.