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The owner of a repair shop often says, "I think the car is always underpowered. What's the reason?" At this time, the owner is big, and the repair foreman is even bigger. The engine power is insufficient. There are many reasons. Which one is still uncertain? Baotou Beiben Heavy Truck Parts discussed the reasons for insufficient engine power. First of all, you must know that the following conditions must be met in order for the engine to achieve full dynamic performance:

1. The fuel supply system, through mechanical or electronic control, provides the engine with an appropriate amount of fuel in a timely manner without or less impurities and moisture;

2. The intake system can provide enough filtered clean air for the engine, so that the air-fuel ratio is close to and completely combusts; The exhaust system shall discharge the exhaust gas to the atmosphere as completely as possible.

3. The piston connecting rod mechanism and valve mechanism should be coordinated, and the exhaust valve should be opened and closed at an appropriate time to ensure that the cylinder and valve have good sealing performance. At the end of the compression stroke, the pressure and temperature reach the optimum value for fuel combustion.

With these basic knowledge, we are studying which faults will lead to insufficient engine power.

? Engine fuel supply system, outside of air intake and exhaust system, outside of engine fuel supply system, outside of air intake and exhaust system

1. The throttle cable is faulty.

(1) The accelerator cable is improperly adjusted after installation. When the accelerator pedal is fully depressed, the accelerator handle on the fuel injection pump does not reach the maximum fuel supply position.

(2) After the acceleration handle is pulled to the position of the fixed limit bolt by hand, the engine speed can reach or close to the rated speed. This can be eliminated only by adjusting the accelerator cable.

2. When the accelerator pedal is fully depressed, the accelerator handle on the fuel injection pump is also held by the limit bolt. However, the engine speed of Baotou Beiben Heavy Truck accessories has not yet reached the rated speed, and this problem can be solved by properly adjusting the limit bolts.

3. The fuel tank filter is blocked, the fuel filter is blocked, the fuel fine filter is blocked, and the oil path is blocked.

4. The oil pump leaks and the oil supply is not smooth.

5. Diesel fuel has poor quality and contains more water and impurities.

6. Air intake system fault. The intake pipe is blocked, bent, and the air filter is dirty, resulting in high intake resistance and poor engine performance.

7. The supercharger is damaged, the supercharging effect of the supercharger is poor, the supercharger bypass fails, the supercharger does not reach the rated speed, the supercharging effect is poor, and the engine lacks power.

8. Incorrect fuel injection pump timing will result in a decrease in engine power.

9. Fuel injection pump failure.

(1) . The plunger pair of the fuel injection pump is worn and stuck;

(2) The fuel outlet valve of the fuel injection pump is damaged;

(3) The fuel injection pump governor is stuck and worn;

10. The smoke detector diaphragm is damaged.

11. The atomization of the fuel injection nozzle is poor, and the coupling is stuck.

12. The return of the exhaust brake butterfly valve is not accurate, which blocks the exhaust passage, and the exhaust resistance is high, resulting in engine weakness.

13. The exhaust pipe and muffler are blocked, and the exhaust resistance is high, causing the engine to be weak.

? Electronic control system failure

1. Fuel injector failure. The needle valve of the fuel injector is stuck and cannot act due to water and impurities in the diesel. The fuel injector does not inject or atomize, but the ECU may not report an error. If the fuel injector harness is worn open circuit or grounded on the cylinder head due to vibration, the ECU will report an error.

2. The water temperature, oil temperature and intake air temperature are too high. Excessive temperature will cause ECU to enter thermal protection and limit engine power.

3. Synchronization signal error.

4. The flowmeter unit is faulty. In case of flow metering problem, the high-pressure oil pump will supply oil to the common rail pipe with maximum capacity. At this time, the pressure relief valve of the common rail will open, and there will be a "click" sound.

5. Accelerator pedal position sensor failure, plug or harness failure. This will cause the engine speed to be limited, causing the engine to weaken.

6. The higher fuel return temperature causes the engine to weaken. The fuel return pipe is bent, its inner diameter is small, and the return oil resistance is large, resulting in high return oil temperature.

? Internal mechanical failure of engine, internal mechanical failure of engine

1. The cylinder head gasket is damaged and the cylinder seal is degraded.

2. The cylinder liner, piston ring and piston ring groove are worn out of tolerance, and the cylinder seals are degraded, resulting in the reduction of engine power.

3. The valve seal is poor, and the cylinder pressure drops, resulting in reduced engine power.

4. The valve foot clearance is too large, resulting in insufficient air intake and incomplete exhaust, resulting in engine damage.

5. Incorrect valve phase, early opening and closing angle of intake valve and exhaust valve, and misalignment of piston and connecting rod mechanism lead to engine power reduction.

6. The engine water temperature is high, which will cause the engine condition to deteriorate and the engine to weaken.

Other faults

1. The clutch slips, the engine power cannot be effectively input into the transmission system, and the vehicle drives slowly.

2. The drive system is improperly adjusted. If the front wheel bearing clearance and the rear wheel bearing clearance are too small, the driving resistance will be great, which will cause the vehicle to drive slowly.

3. The brake system bites, the brake shoes return poorly, and the vehicle is weak.

4. The power assembly of Baotou Beiben Heavy Truck fittings is not correctly matched, and the vehicle is not smooth, especially when the heavy load is going uphill.

5. The vehicle is seriously overloaded, resulting in the vehicle's inability to drive.

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