What Does It Mean When a Car Is in Idle Speed?

[KaydenRose]

Idle speed in a car refers to the driving state where the engine consumes the minimum fuel required for normal operation while maintaining a speed of 1000r/min. Idle does not mean no fuel supply; it simply means providing the minimum fuel consumption necessary for the engine's normal operation, equivalent to the engine being separated from the car without any load applied to it. A normal speed of 1000r/min is considered idle speed. Reasons for unstable idle speed are as follows: Intake manifold or various valve leaks: When air, gasoline vapor, or combustion exhaust enters the intake manifold, it causes the air-fuel mixture to become too rich or too lean, leading to abnormal engine combustion. If the leak affects only individual cylinders, the engine may experience severe shaking, which has a greater impact on cold idle speed. Idle air actuator failure: A malfunction in the idle air actuator results in inaccurate idle air control. Causes for this phenomenon include damaged or stuck throttle motors; damaged or stuck idle stepper motors, duty cycle solenoid valves, or rotary solenoid valves; the car is in a rich fuel injection state during idle.