Why does the car battery have power but the engine won't start?

[VonBraxton]

When the car battery has power but the engine won't start, the following issues may have occurred: Fuel pump failure: A broken fuel pump can prevent the engine from starting. Excessive carbon buildup in the throttle: When the accelerator is not pressed, the throttle leaves only a small gap for air to pass through. If there is too much carbon buildup in this gap, it can block the passage of air, causing the engine to fail to start. Crankshaft position sensor failure: This sensor monitors the position of the crankshaft to determine when to ignite, also known as the speed sensor. If it is damaged, the engine control unit (ECU) will not receive the speed signal during ignition, and thus will not control the spark plug to ignite, because the ECU simply doesn't know that ignition is being attempted. Low battery voltage: Insufficient instantaneous current prevents the starter motor from operating.