What are the reasons for high fuel consumption in China IV diesel vehicles?
2 Answers
China IV diesel vehicles have high fuel consumption mainly due to incomplete diesel combustion and relatively outdated technology. The following is a detailed introduction to the high fuel consumption of diesel vehicles: 1. Insufficient compression: The main reason for incomplete diesel combustion is insufficient compression, commonly known as air leakage. The causes of air leakage are mainly wear and tear of the cylinder liner, piston, and piston rings, resulting in poor sealing, as well as valve leakage due to wear of the valve or valve seat. 2. Poor atomization: Poor diesel atomization. The main reasons for poor atomization are aging of the fuel injector, plunger, and delivery valve, or improper adjustment of the fuel injector. 3. Machine failure: Incorrect fuel supply timing of the machine leads to clogged air filters and poor air intake. Additionally, faults in the engine lubrication system cause incorrect intake and exhaust valve clearances.
I remember there are quite a few common reasons for high fuel consumption when repairing National IV diesel vehicles. Aging or clogged fuel injectors can cause excessive fuel injection, incomplete combustion, and serious waste; excessive carbon buildup in the engine intake manifold affects air flow and reduces combustion efficiency; if the DPF particulate filter is severely clogged, the system will increase fuel injection to raise exhaust temperature for cleaning, leading to additional fuel consumption; a faulty EGR valve may increase exhaust resistance; and unstable fuel pump pressure can cause inaccurate fuel supply. It is recommended to regularly check these minor issues, use professional diesel additives to clean the fuel lines, and avoid letting them develop into more serious faults. A single maintenance session can save a lot on fuel costs.
