故障现象:一辆采用排量2.3升电控汽油喷射发动机的福特轿车,冷机时需踩几脚加速踏板才能起动,起动后发动机怠速居高不下,不踩加速踏板车速就能达到70公里/小时。 故障分析:电控发动机是通过电控怠速控制阀来保证发动机正常怠速转速的。电脑则根据发动机水温和节气门位置来控制发动机怠速的转速。一般发动机在怠速运 Symptoms: a 2.3-liter displacement electronically controlled gasoline injection engine Ford sedans, cold pedal to be a few feet to accelerate the pedal to start, start the engine idle high, do not step on the accelerator pedal speed can reach 70 km / hour. Failure Analysis: Electronic control engine is controlled by the idle speed control valve to ensure the normal engine idle speed. Computer is based on engine water temperature and throttle position to control the engine idle speed. General engine at idle speed