What are the symptoms of diesel exhaust pipe blockage?

The symptoms of diesel exhaust pipe blockage are as follows: 1, car acceleration is weak: engine speed and speed are difficult to improve. This is because poor exhaust leads to less intake and low engine power. 2. Automatic transmission vehicles are forced to downshift frequently: engine power is reduced due to exhaust blockage. In order to make the car have more power output, the driver must step on the accelerator deeply to make it fully open, so ECU controls the automatic transmission to downshift forcibly according to the opening state of the accelerator. 3. There is slight backfire when the engine refuels: When the engine exhausts poorly, some exhaust gas will stay in the cylinder, diluting the mixed steam and slowing down the combustion speed. When the intake valve is opened, the mixed steam is still burning, so the burned mixed steam will enter the intake pipe in the opposite direction through the opened intake valve, causing backfire. 4. "Crash" sound of exhaust pipe: This is mostly a sign that the three-way catalyst is broken, and the broken three-way catalyst can easily cause engine exhaust blockage.