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故障现象一辆行驶里程约为9.5万km的2013款宝马3系车,行驶中左前轮发出“咕噜咕噜”“咔咔”异响,且随着车速不同,异响呈不规则形式发出。故障诊断接车后试车验证故障现象,在正常路面行驶了约1 km,车主反映的异响出现,在驾驶室内感觉异响是从左前轮、左前传动轴、变速器、差速器等几个部件附近传出的。举升车辆,检查两前轮轮胎,无异物夹杂;检查底盘,无碰撞痕迹;检查副车架、控制臂等螺栓的紧固情
Symptoms A mileage of about 95,000 km of the 2013 BMW 3 Series cars, driving the left front wheel issued “grunt grunt ” “Kaka ” abnormal sound, and with different speeds, abnormal sound was not Issued in the form of rules. Fault diagnosis After the test car to verify the phenomenon of failure, the normal road driving about 1 km, the owners reflect the abnormal noise, the sense of noise in the cab from the left front wheel, left front drive shaft, transmission, differential, etc. a few Near the parts. Lift the vehicle, check the front tires, no foreign objects mixed; check the chassis, no collision marks; check the subframe, control arm and other bolts fastening