What if the automatic transmission is broken?

Answer: this question includes two situations: high speed when driving smoothly and high speed when speeding up, which is relatively easy to test. For example, a vehicle with an engine displacement of 2.0L can reach 100 km at 2600 rpm. If it often takes more than 3000 revolutions to reach 100 km, this failure is usually due to high gearbox failure or internal locking of the button changer.

The speed is too high during acceleration, which is a bit complicated, because the increase of engine speed during acceleration is closely related to the accelerator pedal. For example, in a normal Passat, when the engine speed reaches 2500 rpm, the small throttle can accelerate the vehicle, but the large throttle will be raised to 5500-6000 rpm. Such a huge contrast is controlled by the fuzzy logic of the gearbox electronic control system, so this standard needs a certain professional level to complete.

2. The influence of late filing and dead fire filing.

Answer: The criteria for testing gear shifting are starting the engine, idling, braking and gear shifting. Under normal circumstances, if you feel a shift within 1- 1.2 seconds, and release the brake pedal, the vehicle will start slowly, and gradually increase the speed to 10-20km/h without stepping on the accelerator. This is the normal shift standard. If there is a strong impact when entering the gear, it should be noted that any automatic gearbox has a certain degree of impact when entering the gear. If there is no feeling at all, it means that there is an internal fault, but the influence is unacceptable, and the problems caused are very complicated, and there are many aspects besides the gearbox; The case of dead fire in gear is that the engine will die in gear. This problem is more obvious when the car is cold. This problem is caused by gearbox problems and other body systems.