故障现象一辆2008年宝马650车,累计行驶里程约为4万km,搭载N62发动机,客户反映发动机处于热机状态时无法起动。故障诊断接车后,试车,确认故障现象属实。连接故障检测仪,读取的故障代码为0029E7和0029E8,含义为DME在发动机怠速情况下混合气调校的时间因数1和2故障。利用故障检测仪读取相关数据发现,气缸列1和气缸列2混合气均过浓。根据故障现象结合上述检查,认为导致上述故障的可能原因有:空气流量传感器及相关导线故障、氧 Symptom A 2008 BMW 650 car, the cumulative mileage of about 40,000 km, equipped with N62 engine, the customer reflects the engine is in a warm state can not start. Troubleshooting After the car, test the car to confirm the fault phenomenon is true. Fault detectors connected to read the fault code 0029E7 and 0029E8, meaning the DME engine idle time mixed gas adjustment time factor 1 and 2 fault. The use of fault detector to read the relevant data found that cylinder 1 and cylinder 2 column mixture were too thick. According to the fault phenomenon combined with the above examination, it is considered that the possible causes of the above fault are: air flow sensor and related wire fault, oxygen