What are the effects of revving the engine in neutral gear?

[SanWeston]

Revving the engine in neutral gear can have the following consequences: 1. Incomplete combustion. 2. Carbon buildup. 3. Clogging of the three-way catalytic converter. The working principle of the throttle: When the accelerator pedal is pressed, it directly controls the throttle valve, causing the throttle opening to increase and allowing more air to enter the engine. At this point, the ECU commands the fuel injection system to inject more fuel, increasing the engine speed and accelerating the vehicle. Precautions for pressing the accelerator pedal include: 1. Press and release the accelerator pedal gently and smoothly. 2. Coordinate the release of the clutch with pressing the accelerator pedal promptly and precisely. 3. Select the appropriate gear to ensure the engine operates mostly at medium speed and with a larger throttle opening to save fuel. 4. Before driving or turning off the engine, release the accelerator pedal first and avoid revving the engine in neutral gear abruptly.