First, engine deceleration and automatic flameout

　　When the engine is running, the accelerator pedal is released or the vehicle is automatically turned off when the vehicle is running. The fundamental reason is that the idle speed is not stable when the engine is not idling to idle, so the flame is immediately turned off. The specific reasons are the accelerator pedal failure; the crankshaft position sensor and the camshaft sensor signal are not synchronized; the fuel oil pressure is faulty; the control unit signal is incorrect; the injection timing is incorrect. The value of the change from non-idling to idle speed should be checked.

　　Second, the engine power is insufficient or the acceleration is poor

　　The phenomenon of insufficient engine power is basically normal when the engine is running without load. However, when the load is running, the acceleration is slow, the uphill is weak, and the accelerator pedal is still underpowered, and the rotation speed is constant, and the maximum speed cannot be reached. The phenomenon of poor engine acceleration is that the engine speed cannot rise immediately after the accelerator pedal is depressed, there is hysteresis, or the engine has slight fluctuations during acceleration.

　　The reason for the lack of power and poor acceleration is that the fuel system oil pressure is too high or too low; the injector fuel injection is poor; the sensor signal is wrong; the fuel injection amount is too small; the injection timing is incorrect; the cylinder compression pressure is low; The exhaust pipe is blocked.

　　Third, the engine can not start and start difficult

　　There are many factors that cause the electronically controlled diesel engine to start faults. Generally, it can not be started (no initial combustion) and the starting cause is difficult. The methods for checking and troubleshooting are as follows:

　　Check for the presence or absence of a fault code. If so, check the contents of the fault code.

　　Check if the engine can rotate when starting.

　　1 When starting, the starter does not turn, it should be checked according to the cause of the starting system failure. First check the battery storage and pole connection and contact; if it is normal, check the start line, fuse and ignition switch. If the starter can rotate and the engine cannot rotate when starting, the starter and the engine will partially fail.

　　2 When starting, the engine speed is normal, that is, the engine does not start, the fuel injection system and the intake system should be inspected separately.

　　For an electronically controlled fuel injection engine, it is not necessary to step on the accelerator pedal when starting. If the accelerator pedal is fully depressed or repeatedly stepped on the accelerator pedal during starting to increase the fuel supply, the engine speed will increase instantaneously, resulting in an increase in fuel consumption of the engine.

　　Disengage the throttle pedal harness so that the engine can enter idle speed, indicating that the fault has occurred in the accelerator pedal.

　　Visual inspection: Check the intake line for leaks.

　　Oil line inspection: Check the connection status of the oil pipe, the phenomenon of air intake and the quality of the fuel.

　　Harness inspection: Whether the harness connection status is loose or the plug is not secure.

　　Sensor inspection: Check for sensor failure, loose or broken lines, and synchronization of the crankshaft with the camshaft.

　　Check the injector for control signals. If there is no control signal, check the fuses, wiring and ECU. If there is a control signal, check that the spray of the injector is normal.