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故障现象一辆2011款新GL8商务车,搭载LFW发动机(图1)和6速手自一体变速器,行驶里程约为1 15万km。据驾驶人反映,该车最高车速只能达到120 km/h,并且发动机故障灯有时会闪亮。故障诊断接车后试车发现,发动机抖动,加速无力,尾气排放超标。连接故障检测仪进行检测,从发动机控制模块内调得故障代码P0300,其含义为多个气缸出现失火。推断可能的故障原因有:发动机真空泄漏;排气系统堵塞;点火线圈套管漏电或火花塞老化;燃油压力过低或过高;喷油器堵
Symptom A 2011 GL8 commercial vehicle powered by a LFW engine (Figure 1) and a 6-speed automated manual transmission has a mileage of about 1150 km. According to the driver, the maximum speed of the car can only reach 120 km / h, and the engine fault light sometimes shines. Troubleshooting After the car was unloaded, it was found that the engine jitter, weak acceleration, excessive exhaust emissions. Connect the fault detector to the test, tune the fault code P0300 from the engine control module, meaning that there is a fire in several cylinders. Inferred possible causes of the malfunction are: engine vacuum leak; exhaust system blockage; ignition coil casing leakage or spark plug aging; fuel pressure is too low or too high; injector plug