What are the reasons for Isuzu's lack of power and inability to run?

[TaliaDella]

Here are the specific reasons why an Isuzu vehicle may lack power and fail to run properly: 1. Reduced fuel supply in the fuel system: Air intrusion into the diesel fuel supply lines causes a decrease in fuel supply, resulting in minimal fuel in the high-pressure fuel lines. 2. Damaged engine injectors: Poor diesel atomization and injector dripping. Based on past experience, there are two possible reasons for injector dripping: First, during engine operation, high-pressure diesel from the fuel injection system often carries mechanical impurities into the injector, which adhere to the sealing cone surface of the needle valve body, causing poor sealing. Second, due to erosion from high-pressure, high-temperature gases in the combustion chamber and frequent scouring by mechanical impurities during combustion, pitting and erosion marks appear on the sealing ring between the needle valve and its body, degrading the sealing performance and leading to dripping, which results in poor combustion. 3. Fault in the diesel high-pressure fuel pump: Severe wear between the cylindrical pressure relief ring and the delivery valve seat, with the relief band and the upper end of the valve seat worn into a conical shape, creating excessive clearance. This prevents the relief band from fully exposing the valve seat during fuel pump operation, reducing the fuel pressure in the high-pressure line. During the second injection, more fuel supply time is needed to raise the line pressure to the injection pressure, causing a delay in injection timing and reduced fuel delivery. Consequently, excessive residual diesel remains in the high-pressure line when the pump stops, with high residual pressure, leading to incomplete injector spray and post-dripping. 4. Low cylinder pressure issues: Piston ring gaps, broken piston rings, cylinder scuffing, sudden breakage of valve springs or stuck valves, and damaged cylinder head gaskets. Insufficient pressure inevitably causes large amounts of white diesel vapor or oil mist to be expelled from the exhaust pipe, resulting in insufficient engine power.