What does idle operation mean?

[DiAutumn]

Idle state refers to an operating condition when the engine is running without load. The following is an introduction to idle operation: 1. Introduction: A car's idle refers to an operating condition. When the engine runs without load, it is called idling, meaning the car is in neutral gear. The engine speed during idling is called the idle speed. 2. Adjustment: The idle speed can be adjusted by modifying the throttle opening size, etc. Idling means the engine is "producing power without doing work." When the engine is running, if the accelerator pedal is completely released, the engine enters idle state. 3. Meaning: Idle refers to the engine operating without any load, only overcoming the internal friction resistance of its components, without delivering any external power output.

[CamilaDella]

Idle operation refers to the car staying in place while the engine maintains its minimum operating speed. Imagine waiting at a red light with your foot on the brake—the tires aren't moving, but the engine is still running slightly to keep systems like the air conditioning and alternator functioning. My car usually idles at around 800 RPM, which is the state of minimum fuel consumption while keeping the engine from stalling. If the idle speed fluctuates, it might be due to a dirty throttle body or a faulty sensor. After I cleaned the throttle body last time, the idle became much more stable. Prolonged idling wastes quite a bit of fuel—waiting for three to five minutes can consume enough gas to drive a kilometer. That's why cars with auto start-stop systems now automatically shut off the engine at red lights.

[OLucas]

Idle speed, to put it simply, is like the engine running without load - the car is stationary but the engine keeps turning. When repairing vehicles, I often see many older cars with unstable idle speeds. In such cases, we technicians will check basic components like fuel injectors and spark plugs. Normal idle speed should be in the range of 700-900 RPM, and it will be slightly higher when the air conditioning is on. A reminder for new drivers: the high idle speed during the first few dozen seconds of cold starts in winter is normal, as the RPM will drop once the engine oil warms up. However, with the increasing popularity of auto start-stop technology in new cars nowadays, the engine automatically shutting off at red lights truly saves fuel.

[NorahRose]

Idle operation refers to the state where the engine keeps running while the vehicle is stationary. For example, when you're waiting for someone in a parking lot with the engine still on, that's the idle state. During this time, the engine tachometer shows around 750 RPM. This design ensures power supply for the air conditioning and immediate response when starting off. I've found that manually turning off the engine when waiting at a red light for more than 40 seconds is actually more economical, especially in summer when idling with the air conditioning on consumes a shocking amount of fuel—up to 3 liters per hour.