Which outcome occurs when an engine's fuel injectors deliver excessive fuel to the engine cylinders?

💡 Explanation

When excessive fuel is injected, incomplete combustion occurs because there isn't enough oxygen to burn all the fuel completely, leading to unburnt fuel entering the exhaust, damaging the catalytic converter. Therefore, catalytic converter failure results, rather than increased efficiency, reduced emissions, or improved throttle response, which would require an optimized fuel-air mix.

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