What's the reason for only hearing a clicking noise but failing to start the engine?

[GabriellaLee]

Car makes only a clicking sound but fails to start due to the following reasons: Insufficient battery voltage: When the battery voltage is insufficient, it lacks the power to drive the engine to the required starting speed, preventing the car from starting. The repeated engagement and disengagement of the magnetic switch and starter relay produce the clicking sound. Excessive carbon buildup: Too much carbon buildup in the intake manifold, throttle body, or idle air control valve can prevent the engine from achieving the required air-fuel ratio for the mixture. Insufficient fuel supply: Inadequate fuel supply from the fuel system, which is similar to the issue caused by excessive carbon buildup in the intake manifold. Starter motor failure: A faulty starter motor or related wiring issues can prevent the magnetic coil from maintaining engagement, thus failing to provide the necessary starting torque.