Why does the engine speed not drop after releasing the accelerator pedal?

[AngelinaMarie]

If the engine speed does not drop after releasing the accelerator pedal, it may be due to the throttle spring being in a compressed state for a long time, resulting in reduced tension. This causes the throttle opening to increase, leading to higher fuel supply and slower return of the RPM needle. It could also be caused by faulty components or air leaks in the intake system. If this happens right after maintenance, the slow drop in engine speed is not considered a malfunction. The engine speed determines the number of power strokes per unit time or the effective power output of the engine. The effective power varies with different speeds, so when specifying engine power, the corresponding speed must also be indicated. The rated power and rated speed specified on the engine nameplate refer to the effective power and corresponding speed under standard conditions.