一辆行驶了8万km的风神蓝鸟乘用车,故障特征是发动机冷机起动困难,只要发动机起动以后,发动机各种工况,包括行驶时加速工况,均正常。根据上述故障现象,首先怀疑发动机燃油系统有问题,于是对燃油系统供油压力和密封性进行了检查。用燃油压力表测量结果显示,发动机运转时燃油压力为240kPa,在 A driving 80 000 km of the Aeolian Bluebird passenger car, characterized by failure of the engine cold start difficult, as long as the engine starts, the engine conditions, including acceleration conditions, are normal. According to the above symptoms, the first suspected engine fuel system problems, so the fuel system oil supply pressure and tightness were inspected. With the fuel pressure gauge measurement results show that the fuel pressure when the engine is running 240kPa