Why is the car exhaust pipe noisy?

Cars are a means of transportation for modern people. More and more families will buy one to make their lives more convenient. However, when driving, we must pay attention to the safety performance of the car. If there is any abnormality in the car body, do not continue to force driving to avoid accidents. So, some people find that the exhaust pipe of their car is noisy. What is the reason?

What is the reason for the loud noise of the car exhaust pipe?

1. If the sound is loud and obvious, it means there is a high possibility of exhaust pipe backfire;

Exhaust pipe backfire, that is, the fuel is burning in the exhaust system, causing the exhaust pressure to increase suddenly occasionally, causing a popping sound. It may be

A-The engine ignition advance angle is too small;

B-The mixer is too lean, and the engine is not successfully ignited in the cylinder;

C-The mixture is too rich and is not successfully ignited in the cylinder;

D-Cylinder leakage, cylinder pressure is too low to cause ignition failure;

2. When idling, the engine speed is low and the airflow speed of the exhaust system is sometimes fast and sometimes slow. If the rumbling sound is not very loud, it is normal.

3. Severe idle vibration accompanied by severe rattling noise requires inspection.

What to do if the exhaust pipe is very noisy

Remove the exhaust pipe (if the hole is outside and easy to repair, there is no need to remove it).

Check the exhaust pipe for cracks or broken holes.

For large holes and cracks, you can ask the welding master to help weld and fill.

For very small holes, you can use tin foil stickers to stick them firmly.

In addition, if the above repairs are not successful, remember to check whether the muffler inside the exhaust pipe needs to be replaced.

In addition, if the economy allows, you can buy a new exhaust pipe, or if the damage is serious, you also need to buy a new exhaust pipe.

The sound is clear and small.

The reason why the car exhaust pipe emits black smoke

1. The air filter is clogged, resulting in insufficient air intake and too thick a mixer, but this possibility is small.

2. Insufficient cylinder pressure, there may be leakage, such as piston ring misalignment, inaccurate valve timing, etc.

3. If some cylinders do not work (missing cylinders) or ignite too late, it may be a spark plug failure or a problem with the ignition advance angle control.

4. The exhaust system is blocked and the exhaust resistance increases, which may be caused by excessive carbon deposits in the muffler.

5. Engine overload, that is, "a small horse pulling a big cart", such as the car is overloaded, the engine is in low gear and high speed, and large electrical equipment is used in the car.

6. Oxygen sensor failure. The oxygen sensor is installed in the exhaust pipe. It detects the oxygen content of the exhaust gas and feeds back the engine air-fuel ratio to control the concentration of the mixer.

7. The injection pressure of the fuel injector is too low, the atomization effect is not good, etc.

8. The fuel quality is too poor.