案例11车型：宝来1．8T手动挡：行驶里程93000km。故障现象：此车行驶到40～50km/h时车身开始发抖。故障诊断：试车时故障再现,根据经验,故障原因是轮胎不平衡了,需要进行动平衡,但将4个轮做完动平衡后试车,故障仍然存在,于是怀疑可能是轮胎失圆,导致上下跳动,车身发抖,但换上另一辆新车的4条轮胎后,试车,故 Case 11 models: Bora 1.8T manual transmission: mileage 93000km. Symptom: This car driving to 40 ~ 50km / h body began to tremble. Fault diagnosis: reappearance of test failure, according to experience, the cause of the malfunction is the tire imbalance, the need for dynamic balance, but the four wheel balance after the completion of the test run, the fault persists, so the suspect may be out of round tires, leading up and down Beating, body trembling, but put on another four tires of a new car, the test, so