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故障现象一辆仅仅行驶了600 km的金龙XMQ6800G城市公交车(采用玉柴YC4G180-30柴油电控高压共轨发动机),发动机难以起动,即使偶尔能起动成功,发动机转速也只能维持在400 r/min左右,而且此时踩加速踏板发动机无响应。故障诊断试车验证故障现象,上述故障确实存在。试验发现,在起动发动机前,用柴油粗滤器上的手油泵连续泵油,则发动机可顺利起动,而且发动机怠速和加速正常;拔掉燃油计量阀导线侧连接器后起动试车,发动机也可正常起
Fault phenomenon A just driving a 600 km Jinlong XMQ6800G city bus (with Yuchai YC4G180-30 diesel electric high-pressure common rail engine), the engine is difficult to start, even occasionally able to start successfully, the engine speed can only be maintained at 400 r / min or so, and the accelerator pedal at this time the engine is not responding. Fault diagnosis test to verify the phenomenon of the fault, the fault does exist. The test found that, before starting the engine, continuous pump oil on the hand pump on the diesel strainer, the engine can start smoothly, and the engine idle speed and acceleration normal; unplug the fuel metering valve wire side connector after the start of the test run, the engine can be normal Start