What is the normal idle speed for driving?
2 Answers
Car idle speed is generally 700-800 rpm. The specific introduction about idle speed is as follows: 1. Meaning: The idle speed of a car refers to a working condition. When the engine is idling, it is called idle speed, which means the car is in neutral gear. The engine speed at idle is called idle speed. The idle speed can be adjusted by changing the throttle size. Idle speed means the engine is 'working without output'. 2. Normal idle speed: When the vehicle is in a parked state and the engine is started, the minimum speed at which the engine runs stably is called parking idle speed (the process of the engine changing from a cold idle state to an idle state where the engine reaches normal operating temperature is called warm-up or hot start).
The normal idle speed generally ranges between 700 to 900 RPM, but the actual value depends on the vehicle type. From my experience, gasoline cars ideally maintain a stable idle around 700 RPM. If it's too high, like above 800, the throttle might be dirty and need cleaning. If it's too low, below 600, the engine may stall easily. A steady idle RPM is crucial—if it fluctuates, check the spark plugs or air filter. Unstable idle not only affects fuel consumption but also indicates potential issues. It's normal for the RPM to be higher during cold starts in winter, and it will drop as the engine warms up. Don’t worry if the idle rises by about 50 RPM when the AC is on—that’s normal. Over time, changes in idle speed can reflect the vehicle’s health, so timely inspection at a repair shop can prevent major problems.
