Ask the master who is proficient in auto repair for help! Chang 'an CS75 1.5T manual gear, the third gear accelerated sharply, and the fourth gear was not obvious.

According to your description, Changan CS75 experienced a serious setback when it was promoted to the third gear, but it was not obvious when it was in the fourth, fifth and sixth gears. This may be caused by a variety of factors, the following are some possible reasons:

Clutch problem: the clutch may have worn out, so that the clutch plate is no longer firmly connected to the engine and transmission, thus causing reverse when upshifting to third gear. If the clutch is worn, it is recommended to replace it in time.

Transmission problems: there may be problems with the transmission, such as worn gears or insufficient fuel, which leads to a setback when upgrading to third gear. If there is a problem with the transmission, it is recommended to go to the maintenance site for inspection and maintenance.

Engine problems: There may be engine problems, such as ignition system problems or air intake system problems, resulting in a setback when upgrading to third gear. If there is something wrong with the engine, it is recommended to go to the maintenance point for inspection and maintenance.

Driving habits: The driver's driving habits may also be the cause of frustration. If the driver accelerates too fast when upgrading to the third gear, the vehicle may bump. It is suggested to change driving habits appropriately and accelerate slowly.

To sum up, the reasons for Changan CS75' s frustration in 3rd gear may be clutch, transmission, engine or driving habits. It is recommended to go to the maintenance site for inspection and maintenance to ensure the normal operation of the vehicle.