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故障现象一辆上海桑塔纳2000时代超人乘用车,在运行中出现怠速时发动机抖动,加速发冲并冒黑烟,以及动力明显不足等故障。检查分析发动机排气冒黑烟,反映了燃料供给系统混合气过浓,说明汽车负荷工况与实际喷油量不匹配。造成混合气过浓的原因一般有以下几个方面:燃油压力过高;空气流量传感器失效,计量错误;节气门位置传感器和相关电路故障;冷却液温度传感器或进气温度传感器变值;氧传感器及其电路故障;发动机ECU故障。
Symptom A Shanghai Santana 2000 Superman passenger car, idling in the operation of the engine jitter occurs, accelerate the hair red and black smoke, and power obviously inadequate and other failures. Check and analyze engine exhaust black smoke, reflecting the fuel supply system mixture is too thick, indicating the car load conditions and the actual fuel injection does not match. The causes of the mixture is too rich in the following aspects: the fuel pressure is too high; air flow sensor failure, measurement error; throttle position sensor and related circuit failure; coolant temperature sensor or intake air temperature sensor variable; oxygen sensor And its circuit failure; engine ECU failure.