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故障现象一辆金杯SY6480AB-MEH客车,行驶里程约为15万km,因发动机怠速不稳,加速无力,热机后机油警告灯闪亮而到我厂检修。故障排除该车配备的是JM491Q-ME发动机,德尔福(DELPHI)多点电控燃油喷射系统,自带ECM自诊断读码器。打开发动机室盖,检查发动机线束连接正常、机油量正常、发动机可以顺利着机,无异响,起动发动机后,发动机怠速抖动严重,无法急加速,需慢慢踩下加速踏板才能提高发动机转速,高速时,机油警告灯闪亮,测量机油压力为0.08 MPa,怀疑发动机有多个故障。拆下油底壳后,清理机油滤清器上的淤泥,更换机
Symptom A gold cup SY6480AB-MEH bus, mileage of about 150,000 km, due to the engine idle speed instability, weakness, after the heat engine oil warning lights flashing to our factory overhaul. Troubleshooting The car is equipped with the JM491Q-ME engine, Delphi (DELPHI) multi-point electronic fuel injection system, comes with ECM self-diagnostic code reader. Open the engine compartment cover, check the engine wiring harness is connected properly, the normal amount of oil, the engine can smoothly with the machine, no abnormal sound, start the engine, the engine idling jitter serious, can not be accelerated, you need to slowly depress the accelerator to increase engine speed, At high speed, the oil warning light flashes, the measured oil pressure is 0.08 MPa, suspecting that the engine has multiple faults. After removing the oil pan, clean the sludge on the oil filter and change the machine