Will the middle section of Buick Excelle exhaust pipe be blocked?

The exhaust pipe of Buick Excelle will be blocked in the middle. From the design point of view, there is no way to clean Buick exhaust pipe. If the blockage is serious, it should be replaced directly. After the exhaust pipe is blocked, there are phenomena such as weak acceleration, frequent forced downshift of automatic transmission, slight backfire when the engine is refueled, abnormal noise of exhaust pipe and so on.

Blockage symptom

Weak acceleration: If the engine idling is unstable and refueling is weak, and the car feels suffocated during long-distance driving, it may be because the exhaust pipe is blocked, resulting in less air intake and lower engine power.

Frequent forced downshift of automatic transmission: When the engine power drops due to the blockage of the exhaust pipe, the driver will step on the accelerator deeply and make the accelerator fully open. At this time, the car will control the automatic transmission to downshift according to the state of the throttle.

There is a slight backfire when the engine refuels: the blockage of the exhaust pipe will make some exhaust gas stay in the cylinder, dilute the mixture and slow down the combustion speed. When the intake valve is opened, the mixture is still in combustion state, so it will escape back into the intake pipe through the opened intake valve, causing backfire.

Abnormal noise of exhaust pipe: when the engine accelerates or closes the throttle, the exhaust pipe will make a "clang" sound, indicating that the three-way catalyst is damaged and it is easy to cause the exhaust pipe to be blocked.