In terms of air-fuel mixture, what can result from a malfunctioning fuel injector?

A malfunctioning fuel injector can lead to incomplete combustion because the injector is responsible for delivering the precise amount of fuel into the engine's air-fuel mixture. When it does not function properly, it may either deliver too much or too little fuel or atomize the fuel inadequately. This imbalance can result in unburned fuel entering the exhaust system, which not only wastes fuel but also can cause increased emissions and engine knocking. Since combustion occurs less efficiently, this situation leads to a loss in power and can even damage engine components over time. Overall, the correct choice highlights a critical aspect of how fuel injectors affect engine performance and emissions through their role in refining the air-fuel mixture.