What are the common reasons for engine failure to start?

[SanMarcus]

Below are the common causes of engine failure to start: 1. The crankshaft position sensor's resistance is abnormal, causing the crankshaft speed signal to disappear after the engine heats up, leading to engine shutdown; 2. The fuel pump itself is faulty, and after prolonged operation, its resistance changes, preventing it from functioning properly to provide normal fuel pressure, resulting in engine shutdown when hot; 3. Ignition system failure, where the ignition module overheats and cannot function properly, causing the ignition voltage to fail and the engine to shut down; 4. Abnormal throttle signal voltage or improper engine computer control can both cause the vehicle to stall while driving.