The abnormal sound of the engine indicates that the technical state of the engine mechanical device has changed. Some abnormal noises can indicate that the engine may be accidentally damaged, so it is necessary to find the problem as soon as possible and find out the reason. The main reasons for the abnormal noise of the engine are:

1, engine hysterical sound problems can be divided into air filter, spark plug, ignition wire, gasoline, gasoline filter, gasifier, oil pump and other problems. Check whether the air filter is dirty, whether the spark plug is old and needs to be replaced, whether the ignition coil is broken, and whether the gasoline is dirty, such as water in the oil circuit. And check the oil pump, carburetor and so on.

2. When driving, the acceleration is normal, and the ignition may be normal. However, if driving at a constant speed, it is found that the engine speed is too high, but the speed still seems to be unable to be lifted. Try to check the coolant. If the oil pressure is too high or too low, check the oil pressure gauge. It is also possible that there is a problem with the ignition time setting, which will also cause such symptoms. As for the others, it may be an internal problem of the engine, such as egr.

Valve blockage, etc.

3. The engine hisses, which may be a problem. The engine is overheated. Check the cooling system. The exhaust system is blocked, and the vacuum tube leaks or breaks.

4. The engine will whir when accelerating, or it will appear when decelerating. In short, as the speed changes, the volume will also change. Possible cause: the power steering oil is insufficient and filled with oil. The generator bearing may be damaged. When there is a problem with the power steering pump and water pump, it will also produce similar noise.

The exhaust pipe makes a lot of noise. The main problem is the exhaust system. Check whether the exhaust pipe is broken.

7. When you step on the accelerator, you will hear a bang, bang sound coming from the exhaust pipe. The sound may not be very loud, the car will not be abnormal when driving, and the fuel consumption will increase. It is recommended to check whether the muffler and exhaust pipe are damaged.

8. Possible causes of engine kicking sound. There is dust inside the engine. It is recommended to change the oil, filter the engine and clean the engine. There may be a valve problem.