What Causes Engine Misfire?

[Thompson]

Engine misfire causes: 1. Excessive wear gap in engine cylinder liner piston rings, intake and exhaust valves not sealing tightly, or valve oil seal leakage leading to insufficient cylinder pressure causing misfire. 2. Poor fuel atomization due to injector wear, resulting in increased or decreased fuel injection quantity, or even no fuel injection leading to misfire. 3. For high-pressure common rail engines, there may also be misfires caused by malfunctions in the engine control unit (ECU). 4. Another major cause of engine misfire is substandard diesel fuel quality. Excessive impurities can cause engine wear. Therefore, always use certified fuel and perform regular engine maintenance, which can significantly reduce the likelihood of misfire occurrence.