故障现象一辆2001年出厂的丰田皇冠3.0轿车(配备2JZ-GE发动机),中低速行驶正常,当车速达到100 km/h以上时,会出现严重“发冲”现象(在稳住加速踏板的情况下轿车“发冲”),并且在急加速时,车速提升缓慢,可以很清晰地听到排气管内有放炮声。故障诊断首先验证故障现象,上述故障确实存在,于 Fault phenomenon A 2001 Toyota Crown 3.0 sedan (equipped with 2JZ-GE engine), normal driving at low speed, when the speed reached 100 km / h or more, there will be a serious “hair red” phenomenon (in the steady acceleration Pedal “car” hair red "), and in the case of rapid acceleration, the speed increase slowly, you can clearly hear the exhaust pipe sounding gun. Fault diagnosis First verify the fault phenomenon, the fault does exist, at