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故障现象:一辆1994年生产的江铃客货车,装用4JB1型发动机,行驶里程20万km。该车冬季冷车不易起动,起动后冒黑烟,不能加速,只有等热车后才能正常行驶。故障检修:修理人员根据柴油车的检查维修常规(供油、缸压、点火),首先对油路进行检查,更换了燃油泵、滤清器,校验了喷油嘴,但故
Symptom: A JMC produced in 1994 is equipped with a 4JB1 engine and has a mileage of 200,000 km. The car cold winter car is not easy to start, start black smoke, can not accelerate, only after the hot car to normal driving. TROUBLESHOOTING: According to the inspection and maintenance routine of diesel vehicles (oil supply, cylinder pressure, ignition), the repairman first checks the oil passage, and changes the fuel pump, filter and nozzle, but