What are the reasons for the inability to accelerate in an electronically controlled diesel engine?
2 Answers
There are three main reasons why an electronically controlled diesel engine cannot accelerate (unable to increase RPM): 1. Fuel line blockage, insufficient fuel supply. 2. Injector pressure relief causing rail pressure to be too low. 3. Common rail pressure relief valve causing rail pressure to be too low. Below is additional information: 1. Electronically controlled diesel engine: Its function is to electronically control the fuel injection system, enabling real-time control of fuel injection quantity and timing based on operating conditions. It utilizes sensors for RPM, throttle position, injection timing, intake air temperature, intake air pressure, fuel temperature, and coolant temperature. 2. Data processing by computer: The real-time detected parameters are input into the computer (ECU) simultaneously, compared with pre-stored set parameter values or parameter maps (MAP diagram), and after processing calculations, commands are sent to the actuator based on optimal values or calculated target values.
I remember a while ago when I was driving an electronically injected diesel truck, I also encountered a situation where it couldn't accelerate properly. Later, it was found that the fuel filter was clogged, causing poor fuel flow and insufficient fuel supply to the engine. The electronic injection system relies on precise fuel pressure. If the diesel contains too many impurities or maintenance is neglected, the buildup of dirt on the filter screen can restrict the flow. Another common cause is a faulty accelerator pedal sensor, which can mislead the control unit into misjudging the throttle opening, thereby not responding to acceleration demands. Some electronic injection components, such as a worn high-pressure fuel pump or corroded wiring, may also cut off the normal fuel supply. When dealing with the issue, I prioritized checking the simpler things: replacing the filter or cleaning the fuel lines. If that didn't work, I would then inspect the sensor wiring connections. If the problem is ignored for a long time, the engine may suffer severe wear or even stall. For safety reasons, it's best to visit a professional shop early and use diagnostic tools to scan for trouble codes. Cleaning the air filter when changing the oil can also help ensure the overall system operates smoothly.
