Aiming for interior abnormal noise in one sedan, the main noise source which is engine intake system is identified by road experiment.
针对某轿车车内异常噪声现象，通过道路试验进行了噪声源识别，发现发动机的进气系统是异常噪声的主要来源。
Stop engine, find causes and remove faults when oil pressure is low, water temperature is high, abnormal smokes or noise happen.
当出现机油压力过低、水温过高以及有异常排烟或响声时，应立即停机查清原因并进行排除。
After cleaning, the vehicle road test to determine the engine in the course of no abnormal noise.
清理完毕后，进行车辆路试，以确定发动机在行驶过程中无异常噪音。
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