There are many reasons for the high fuel consumption of the engine. Generally speaking, when the power of the engine is insufficient or black smoke is emitted, the fuel consumption of most engines is too high in this case. This problem should not be ignored when troubleshooting. As for the troubleshooting of high fuel consumption, the following steps can be roughly followed.

1、外部检查。仔细询问驾驶员故障的现象，发生的时间、情况、大体判断故障的部位是机械系统的问题还是电控系统的问题。同时也可用故障诊断仪调取故障码。若有故障码，按故障码所指示的内容行排除；若无故障码，可行基本检查。在进行检查之前，行外部检查、这方面包括两个内容。

1. External inspection. Carefully ask the driver about the fault phenomenon, time and situation, and generally judge whether the fault is the problem of mechanical system or electronic control system. At the same time, the fault diagnosis instrument can also be used to call the fault code. If there is a fault code, eliminate it first according to the contents indicated by the fault code; If there is no fault code, conduct basic inspection first. Before inspection, conduct external inspection. This includes two contents.

1)检查各传感器接头是否脱落。打开机罩，逐个检查各传感器的接头是否松脱、断裂，用手轻轻扳动，并插好传感器，对于灰尘较多的传感器应清理于净，以免影响信号的传送效果。

1) Check whether each sensor connector falls off. Open the hood, check whether the connectors of each sensor are loose and broken one by one, gently pull it by hand, and plug in the sensors. Clean the sensors with more dust to avoid affecting the signal transmission effect.

2)检查管接头是否破损脱落。检查进气系统管道是否破裂漏气，接头是否松落，进油管道、接头是否漏油，发现漏油、漏气的地方应进行处理，及时清洁和更换空气滤清器滤芯。

2) Check whether the pipe joint is damaged or fallen off. Check whether the air inlet system pipe is broken and leaking, whether the joint is loose, and whether the oil inlet pipe and joint are leaking. If any, deal with it, and clean and replace the air filter element in time.

2、基本检查

2. Basic inspection

1)检查燃油系统压力。若压力过高，应检查燃油压力调节器是否正常，滤网是否堵塞，汽油滤清器是否堵塞。

1) Check the fuel system pressure. If the pressure is too high, check whether the fuel pressure regulator is normal, whether the filter screen is blocked and whether the gasoline filter is blocked.

2)检查火花塞、高压线。查看火花塞电极烧蚀是否严重，若严重应及时更换；同时，检查高压线有否漏电现象，如有应及时更换。火花塞烧蚀和高压线绝缘被击穿漏电后，易造成点火能量不足，导致混合气燃烧质量下降、功率不足、油耗过高等问题。

2) Check the spark plug and high-voltage wire. Check whether the electrode ablation of spark plug is serious. If it is serious, replace it in time; At the same time, check whether the high-voltage line has leakage, and if so, replace it in time. After the ablation of spark plug and the breakdown and leakage of high-voltage wire insulation, it is easy to cause insufficient ignition energy, resulting in the decline of mixture combustion quality, insufficient power and high fuel consumption.

3)检查喷油器。喷油器损坏或堵塞时会产生怠速缺缸、加速无力、排气管放炮，加速时有耸车的现象或供油不足的感觉；造成油耗过高。

3) Check the fuel injector. When the fuel injector is damaged or blocked, there will be idling cylinder shortage, weak acceleration, exhaust pipe shooting, vehicle shrugging or insufficient oil supply during acceleration; The fuel consumption is too high.

喷油器的检查，可拔下喷油器连接电脑的插头，用万用表测量各插脚的电压值，此值应为蓄电池的电压值，否则视为电磁线圈断路；测量各个喷油器两插脚之间的电阻值，若为0则表示短路。

For the inspection of fuel injector, unplug the plug connecting the fuel injector to the computer, and measure the voltage value of each pin with a multimeter. This value should be the voltage value of the battery, otherwise it will be regarded as an open circuit of the solenoid coil; Measure the resistance between the two pins of each fuel injector. If it is 0, it indicates a short circuit.