Reasons for slow acceleration and weak uphill performance of diesel vehicles:
（1） Air leakage of air intake system;
（2） Dirty intercooler Dirty compressor impeller;
（3） The intake port of cylinder head is dirty;
（4） Inaccurate timing of air distribution due to air inlet and exhaust pipe leakage;
（5） Turbocharger failure, such as low intake pressure;
（6） Air filter failure, such as dirt and blockage caused by improper quality or maintenance.

Reasons for slow acceleration and weak uphill performance of diesel vehicles:
1. The engine oil system is the place where cars often have problems. There are many aspects of the engine oil circuit system that can make the car weak when going uphill. For example, the fuel injection nozzle is blocked, the fuel pipe leaks, the power of the gasoline pump is reduced, and the gasoline filter is blocked, which will cause the car to be weak when going uphill. The main reason why the car feels powerless is that the engine does not have enough oil when going uphill, the combustion efficiency is reduced, and the horsepower does not meet our requirements. So first check whether there is a problem with the engine system.
2. In addition, the air intake system is the same. The engine needs air as well as oil. If the air filter, throttle and other components are blocked or have problems, resulting in insufficient air intake, the car will also be unable to accelerate and slow down.
3. The spark plug is also the source of common faults. If the spark plug ignition is poor, it may lead to weak acceleration.
4. If the car is not strong and the steering wheel or body shakes obviously when the car stops, it means that at least one cylinder of the car's engine is not working properly or is stalling. Generally, if one cylinder of a four cylinder engine does not start, the engine can still run. With the increase of the number of cylinders, this symptom is more difficult to detect.
5. If you turn on the air conditioner in summer, small displacement vehicles will feel hard to accelerate, and the fuel consumption will increase significantly. This is because the air conditioner needs to drive the compressor when it is working, and the compressor needs a very large power when it is working. The engine needs to carry such a large internal consumption, so it is inevitable that you will feel weak when accelerating slowly.
6. In addition, we can judge where the problem is based on other symptoms, such as black smoke from the exhaust pipe, which means problems in the combustion chamber, ignition system and valves; If the exhaust pipe emits blue smoke, it is possible that the engine oil runs into the combustion chamber, which is what we call burning engine oil.
7. Finally, there is another situation, that is, the tire pressure is insufficient. This situation will also lead to the feeling that the car is unable to speed up.

There are many reasons for the slow acceleration of the car. The poor quality of the oil used will also affect the fuel filter and oil circuit, which may lead to poor fuel supply, leading to weak acceleration. But we can know that they are concentrated in the ignition, air intake, oil circuit and other systems of the engine. So we can eliminate the problems of the car being sluggish, stuffy, slow acceleration, and fuel consumption by troubleshooting and checking them one by one. In fact, the key points of the car are in the above mentioned areas. It should also be noted that when refueling, do not choose the oil with poor oil quality.