Bora's exhaust pipe is loud, and I suddenly thought, how to solve it?

The abnormal noise of Bora exhaust pipe may be due to the unstable idle speed of the vehicle.

There are many reasons for the unstable idle speed of vehicles. When the idle speed is unstable, the sound of natural exhaust pipe is different from usual.

According to different models and designs, there are many reasons:

Air inlet:

A, air intake system leakage or blockage, etc. Will lead to.

B. Idle speed control part: stepper motor and throttle body are dirty or leaking.

C sensors such as air pressure, temperature and throttle position are abnormal, and the data is incorrect.

Oil pipeline:

First, blockage, patency, etc. Will lead to.

B the electric fuel pump is abnormal, or the fuel filter is blocked or the delivery is blocked due to various reasons.

C. Abnormal fuel nozzle: It can be caused by its own quality failure, or by various defects such as foreign body blockage, poor sealing and rubber ring aging.

D. abnormal rail pressure.

Brief introduction of back pressure exhaust pipe:

(As environmentally friendly as the original factory) The principle is the same as the original factory, but the sound will be better than the original factory. Most of the original factories use this kind of pipeline, mainly through the grid muffler in the pipeline or the volume change of the pipeline, resulting in a pressure that will return to the cylinder. When the engine is ignited, the piston begins to make a radial power stroke, and the exhaust valve will open before the piston reaches the bottom dead center.

At this time, the back pressure in the pipe will prevent the exhaust gas from rushing out and make the mixture burn completely. However, if the back pressure is too strong, the exhaust gas can not be completely discharged from the cylinder, which will cause the exhaust gas to burn with the mixed gas and reduce the combustion efficiency. Of course, the most direct thing is to induce horsepower output.

Its advantages: low noise and good low-speed torque. Disadvantages: exhaust gas can not be discharged quickly at high speed, which affects the power output of the engine and has a small volume.