What are the reasons for engine failure to start or difficulty in starting?

[DelJanelle]

Engine failure to start or difficulty in starting may be caused by: 1. Malfunction in the speed signal system: This can prevent the electronic control unit from receiving speed and crankshaft position signals, leading to incorrect control of fuel injection and ignition timing, resulting in non-operation of the fuel injector and no spark at the spark plug; 2. Fuel pump and control circuit failure: This can cause the fuel supply system to have no fuel pressure, and even if the fuel injector is functioning normally, fuel cannot be properly injected. The car engine is the device that provides power to the vehicle, serving as the heart of the car, determining its power, fuel efficiency, stability, and environmental performance. Depending on the power source, car engines can be categorized into diesel engines, gasoline engines, electric vehicle motors, and hybrids, among others.