Why does the Envision 20T transmission produce abnormal noise?

[LandonFitz]

If the interior of the transmission is dirty, or components such as bearings and gears are worn or severely worn, or there is damage to the gear side, abnormal noise from the transmission can be heard when the car is idling or under high load. Below are the methods to deal with abnormal noise in cars: 1. If there is abnormal noise from the engine while driving, but the noise persists when the engine is kept running during a stop inspection, you can loosen the carburetor adjustment needle slightly and then start the engine for testing. If the abnormal noise appears, its characteristics can be diagnosed. 2. If there is still no abnormal noise, you can disable a cylinder in advance and conduct a rapid acceleration test. This can both make the abnormal noise appear and determine the relationship between the noise and the cylinder position.