故障现象一辆行驶里程约为38万km的苏州金龙KLQ6125B1A型客车(配置玉柴YC6L330-30发动机),驾驶人反映该车动力性差,爬坡困难,上长坡时需要连续减挡。故障诊断维修技术人员询问驾驶人后得知,该车最近一段时间加速性差,行驶到有坡度路段时,车速会降到很低,油耗明显增加。根据柴油机工作原理分析认为,加速性差应该与发动机的进气系统、燃油供给系统和冷却系统有关。先用手摸、耳听、鼻闻的传统诊断方法,检查进气管道、燃油管 Fault phenomenon A mileage of about 380,000 km Suzhou Jinlong KLQ6125B1A bus (configuration Yuchai YC6L330-30 engine), the driver reflects the poor power of the car, climbing difficulties, the need for continuous downhill on the long slope. Fault diagnosis and maintenance technicians asked the driver to learn that the recent acceleration of the car was poor, driving to a gradient section, the speed will drop to a very low fuel consumption increased significantly. According to the analysis of the working principle of diesel engine, poor acceleration should be related to the engine intake system, fuel supply system and cooling system. First hand touch, ear, nose smell the traditional diagnostic methods, check the intake pipe, fuel pipe