What can happen if a worn-out fuel injector is not replaced?

When a worn-out fuel injector is not replaced, it can lead to increased emissions and potential engine damage. Fuel injectors are critical components that supply the correct amount of fuel into the engine for optimal combustion. When they become worn, they may not atomize the fuel properly or may leak fuel, leading to an overly rich fuel mixture. This can result in incomplete combustion, leading to unwanted emissions of hydrocarbons and carbon monoxide, both of which contribute to air pollution.

Furthermore, the engine may operate at suboptimal performance levels. If the fuel mixture is too rich, it can cause carbon buildup in various engine components, including the combustion chamber and the exhaust system. Over time, this buildup can lead to misfires, rough idling, and even severe engine damage, as excessive fuel can wash away protective oil from cylinder walls, leading to increased wear.

In contrast, options suggesting improved fuel efficiency or enhanced engine performance are unlikely because a malfunctioning injector typically results in poorer fuel atomization and inefficient combustion. The claim of no significant change in performance ignores the crucial role that the fuel injector plays in maintaining engine health and efficiency, hence not recognizing the detrimental effects of neglecting a worn-out injector.