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案例1宝马E60车发动机怠速间歇性抖动故障现象一辆行驶里程约为11万km的宝马E60轿车(发动机型号为N52K),车主反映该车发动机怠速会出现间歇性抖动的问题。故障诊断接车后首先验证故障现象,经试车确认故障的确存在,且热车状态下发动机怠速抖动比较明显,大约10 s抖一下。用故障检测仪检测,无故障代码存储,读取相关动态数据,也未发现异常,只有怠速时的转速随着抖动而上下波动,空燃比也未发现异常。分析认为造成上述故障的可能原因有发动机进气系统真空泄漏、曲轴箱通风系统损坏、燃油蒸发排放系统故障、点火系统故障和发动机
Case 1 BMW E60 engine idling intermittent jitter Fault phenomenon A mileage of about BMW E60 sedan about 110,000 km (engine model N52K), the owner of the car engine idling intermittent jitter will appear the problem. Troubleshooting After the first car to verify the fault phenomenon, the test car to confirm the fault does exist, and the hot car engine idling jitter is obvious, about 10 s shake it. Detected by the fault detector, fault-free code storage, read the relevant dynamic data, nor found abnormal, only idle speed fluctuations with jitter, air-fuel ratio also found no abnormalities. The possible causes of the above-mentioned failures are the vacuum leakage of the engine air intake system, the damage of the crankcase ventilation system, the failure of the fuel evaporative emission system, the ignition system failure and the engine