What does first gear idle mean?

[VonAndres]

First gear idle refers to the engine running under no-load conditions, only overcoming the frictional resistance of its internal components without delivering any external power output. Idle speed is the minimum speed required to keep the engine running, which is the speed when the car is in neutral and the engine is idling. Relevant details are as follows: Idle driving speed: For an engine with good working performance, its idle speed is generally between 550-800 RPM. The idle driving speeds are typically: 2-5 km/h in first gear, 5-10 km/h in second gear, 10-15 km/h in third gear, 15-20 km/h in fourth gear, and 20-30 km/h in fifth gear. Idle speed can easily cause oil burning: During idling, the throttle opening is small, and the vacuum level inside the intake manifold is high, making it easy for oil vapor to be drawn into the intake manifold. Some of it deposits inside the intake manifold, forming carbon-like substances or coking. Prolonged low-speed driving or idling, especially in turbocharged models, may result in a pool of oil in the intake manifold behind the throttle. However, this oil usually disappears after high-speed driving.