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、外部檢查。仔細(xì)詢問駕駛員故障的現(xiàn)象，發(fā)生的時(shí)間、情況、大體判斷故障的部位是機(jī)械系統(tǒng)的問題還是電控系統(tǒng)的問題。同時(shí)也可用故障診斷儀調(diào)取故障碼。若有故障碼，按故障碼所指示的內(nèi)容先進(jìn)行排除；若無故障碼，可先進(jìn)行基本檢查。在進(jìn)行檢查之前，先進(jìn)行外部檢查、這方面包括兩個(gè)內(nèi)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)檢查各傳感器接頭是否脫落。打開機(jī)罩，逐個(gè)檢查各傳感器的接頭是否松脫、斷裂，用手輕輕扳動(dòng)，并插好傳感器，對(duì)于灰塵較多的傳感器應(yīng)清理于凈，以免影響信號(hào)的傳送效果。

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)檢查管接頭是否破損脫落。檢查進(jìn)氣系統(tǒng)管道是否破裂漏氣，接頭是否松落，進(jìn)油管道、接頭是否漏油，發(fā)現(xiàn)漏油、漏氣的地方應(yīng)進(jìn)行處理，及時(shí)清潔和更換空氣濾清器濾芯。

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、基本檢查

2. Basic inspection

1)檢查燃油系統(tǒng)壓力。若壓力過高，應(yīng)檢查燃油壓力調(diào)節(jié)器是否正常，濾網(wǎng)是否堵塞，汽油濾清器是否堵塞。

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)檢查火花塞、高壓線。查看火花塞電極燒蝕是否嚴(yán)重，若嚴(yán)重應(yīng)及時(shí)更換；同時(shí)，檢查高壓線有否漏電現(xiàn)象，如有應(yīng)及時(shí)更換。火花塞燒蝕和高壓線絕緣被擊穿漏電后，易造成點(diǎn)火能量不足，導(dǎo)致混合氣燃燒質(zhì)量下降、功率不足、油耗過高等問題。

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)檢查噴油器。噴油器損壞或堵塞時(shí)會(huì)產(chǎn)生怠速缺缸、加速無力、排氣管放炮，加速時(shí)有聳車的現(xiàn)象或供油不足的感覺；造成油耗過高。

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.

噴油器的檢查，可拔下噴油器連接電腦的插頭，用萬用表測量各插腳的電壓值，此值應(yīng)為蓄電池的電壓值，否則視為電磁線圈斷路；測量各個(gè)噴油器兩插腳之間的電阻值，若為0則表示短路。

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.