Which component controls the engine's air-fuel mixture in a variable valve timing system?

Study for the Michigan Mechanic Engine Repair Exam. Prepare with comprehensive questions and detailed answers. Get ready for your exam confidently!

The component that controls the engine's air-fuel mixture in a variable valve timing system is the variable valve timing actuator. This actuator is critical for optimizing the engine's performance by adjusting the timing of the valve lift events. By influencing when the intake and exhaust valves open and close, the actuator allows for a more precise control of the air entering the combustion chamber and the timing of the fuel injection.

This control capability enhances performance across different engine speeds and loads, contributing to improved fuel efficiency, reduced emissions, and enhanced power output. While fuel injectors deliver the fuel into the engine, they operate in conjunction with the variable valve timing system to ensure the correct mixture of air and fuel is achieved for optimal combustion.

The throttle body, which regulates airflow into the engine, does play a role in determining the amount of air mixed with fuel, but it does not directly manage the timing adjustments provided by variable valve timing. Similarly, the catalytic converter is involved in emissions control rather than in regulating the air-fuel mixture during combustion.

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