What is the ideal idle speed for a car?

1 Answers
MaggieAnn
07/30/25 1:32am
Normally it ranges between 700-800 RPM. Below is relevant information about car idle speed: 1. The function of car idle speed: Idle speed is an operational state of a car, referring to the engine running in neutral gear. The engine speed during idle is called idle speed. Idle speed can be adjusted by modifying parameters like throttle opening. Idling means the engine is "producing power without doing work". When the engine is running and the accelerator pedal is fully released, the engine enters idle state. 2. Causes of unstable idle speed: Direct causes refer to mechanical components being dirty, worn, or improperly installed, leading to variations in cylinder power output which creates imbalance among cylinders, resulting in unstable idle speed; Indirect causes refer to abnormalities in the engine's electronic control system causing poor combustion mixture, making it difficult to balance cylinder power output and resulting in unstable idle speed.
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