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故障现象一辆2 014年3月产宇通客车(型号为ZK6758HAA),搭载玉柴YC4EG180-40发动机,累计行驶里程约为30万km。驾驶人反映,早上起动发动机时,起动机运转有力,但发动机难起动,需起动2次才能起动着机,且起动后发动机抖动严重,踩下加速踏板,发动机无法加速,怠速运转约10 min后加速恢复正常。故障诊断接车后试车,故障现象与驾驶人所述一致,发动机怠速转速只有350 r/min,马上将发动机熄火再接
Fault phenomenon A February 2014 Yutong Bus (model ZK6758HAA), equipped with Yuchai YC4EG180-40 engine, the cumulative mileage of about 300000 km. The driver said that in the morning, when the engine was started, the starter was powerful but the engine was hard to start. The starter needed two starts to start the engine. After the start, the engine was shaken severely. When the accelerator pedal was pressed, the engine could not accelerate. After idling for about 10 minutes Speed up back to normal. Fault diagnosis After the test car, the phenomenon of the fault and the driver described the same, the engine idle speed of only 350 r / min, immediately turn the engine off