What Causes an Engine to Inject Fuel but Not Ignite?

[DeDallas]

Check for faults in the ignition system, electrical circuits, electronics, and fuel system. Ignition Fault: Assuming the fuel system is intact and the battery has sufficient power, you can disconnect the main high-voltage wire, hold it with insulated pliers (to prevent electric shock), and position it 0.3mm away from the engine body. Then, start the engine and observe whether a spark jumps at the 0.3mm gap, noting its strength. If there is no spark, it indicates an ignition system fault. Electrical Circuit Fault: Possible causes include blown fuses, open circuits in the high-voltage coil, breaks in the low-voltage circuit, detached central ignition wire, leaking distributor rotor, or damaged spark plugs. Electronic faults mainly refer to the failure of the central computer control board. Fuel System Fault: Stalling caused by fuel system issues often comes with symptoms like engine weakness or a feeling of stepping on a soft accelerator pedal. Problems may include a malfunctioning fuel pump, blocked fuel lines, clogged fuel filters, a failed carburetor, or damaged injectors. Sometimes, the issue is simply an empty fuel tank that the owner is unaware of. Adding a few liters of gasoline can resolve all the problems.