故障现象一辆长安马自达福特蒙迪欧轿车(车型为CD345,采用2.3 L发动机和自动变速器),累计行驶里程为8.35万km,该车在颠簸路面或猛打转向盘时发动机下部有“咯吱、咯吱”的异响声。故障诊断该车因此故障已经多次来店维修,先后更换过减振器、减振器压力轴承、下控制臂和副车架等,但每次更换后用不了几天,有时甚至是几个小时,异响声就再次出现。由于客户这次进厂维修的时候外面正在下雨,接车后无 Symptoms A Changan Mazda Ford Mondeo sedan (model CD345, with a 2.3 L engine and automatic transmission), the cumulative mileage of 83,500 km, the car bumpy road or hit the steering wheel at the bottom of the engine has a “creak, creak ”Sound of abnormal sound. Fault diagnosis The car so many times to repair the store, has replaced the shock absorber, shock absorber pressure bearing, the lower control arm and subframe, etc., but after each replacement in less than a few days, and sometimes even a few hours , Abnormal sound again appeared. As the customer into the factory when the outside is raining, after the car without