Do automatic transmission cars have idle speed?

[LaElliana]

Automatic transmission cars do have idle speed, which refers to the engine running without load. The idle speed of an automatic transmission car is typically around 5-10km/h, depending on the vehicle's idle RPM and overall condition. Automatic transmission gear positions: P (Park) is for long-term parking. R (Reverse) is engaged when the vehicle needs to move backward. N (Neutral) is used when the vehicle is temporarily parked without turning off the engine. D (Drive) is the forward gear - when the gear lever is in D position, the vehicle will automatically shift gears based on throttle opening and speed data. S (Sport) mode makes the vehicle drive more sportily. M (Manual) mode allows the driver to manually shift gears when the lever is in M position. L (Low) is the low-speed gear. Idle speed can be adjusted. It's generally regulated by adjusting the throttle opening size and idle fuel supply. The engine should operate smoothly within the idle range without vibration and maintain good acceleration performance. Note that idle speed adjustment should avoid frequent RPM fluctuations, as this may cause engine wear.