Why does the engine speed rise abnormally when the accelerator is pressed?

[Justin]

Because a dirty throttle position sensor or voltage imbalance can cause electronic throttle failure, resulting in the situation where the speed does not increase even when the accelerator is fully pressed. Below is a related introduction about throttle speed: 1. Cause: The reason is that the torque converter is not locked. The throttle controls the opening of the throttle valve, affecting the engine's air intake. After pressing the accelerator, the amount of fresh air entering increases, and the fuel injection amount controlled by the ECU also increases, thus the force generated by combustion increases, pushing the engine's operating speed to rise. 2. Principle: Pushing the engine's operating speed to increase. Under normal circumstances, when the engine speed, vehicle speed, and throttle depth reach a certain level, the torque converter will lock. Before it locks, it is easy to encounter the situation where pressing the accelerator results in the engine roaring but the car not moving.