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故障现象一辆2004年产瑞风商务车,搭载韩国现代G4JS 2.4 L发动机和手动变速器,行驶里程约为51万km。该车因发动机无冷车高怠速而进厂维修。故障诊断据驾驶人反映,该车发动机无冷车高怠速的情况已经有2年多了,为此曾经检修过多次,但故障现象仍然存在,为排除此故障,已对节气门、进气道和喷油器进行过多次清洗,近期又对发动机进行了大修。此外,车辆已更换过很多元件,如火花塞、点火线圈、分缸线、冷却液温度传感器、曲轴位置传感器、凸轮轴位置传感器、燃油泵、节气门总成及
Trouble phenomenon A 2004 Ruifeng commercial vehicle, equipped with South Korea’s Hyundai G4JS 2.4 L engine and manual transmission, mileage of about 51 million km. The car into the factory due to high idle engine idle maintenance. According to the driver to reflect the fault diagnosis, the car engine without idle high idling situation has been more than two years, this has been repaired several times, but the fault still exists, in order to rule out the malfunction, the throttle, intake Road and injector were cleaned several times, the engine has recently undergone major repairs. In addition, the vehicle has been replaced by many components, such as spark plugs, ignition coils, cylinder line, coolant temperature sensor, crankshaft position sensor, camshaft position sensor, fuel pump, throttle valve assembly and