What are the reasons for lack of power in 4th and 5th gears?

[SanOlivia]

The reasons for lack of power in 4th and 5th gears are as follows: Throttle Position Sensor Malfunction: When the accelerator pedal is pressed, the cable drives the throttle valve, which is the throttle. The throttle valve is equipped with a position sensor. The control unit uses the signal from the throttle position sensor to determine the throttle opening and then calculates the corresponding signal voltage. Finally, the vehicle's fuel injection volume is calculated based on this signal voltage. Therefore, if the throttle position sensor is dirty or the voltage is unbalanced, it can lead to electronic throttle failure, resulting in the situation where the speed does not increase even when the accelerator pedal is fully pressed. Engine Malfunction: Among the three systems of the engine—intake, fuel, and ignition—the throttle position sensor signal, as mentioned earlier, is actually part of the intake system. For the engine to operate normally, it requires sufficient air. If there is a leak or blockage in the intake system, the car may experience reduced power, inability to increase RPM, and body shaking when the accelerator pedal is pressed.