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What is the general idle speed of a car?

1 Answers

OBrantley

07/29/25 6:43pm

Car idle speed varies between cold and warm engine conditions. When the engine is warm, the idle speed ranges from 550 to 800 RPM, while in cold conditions, it ranges from 950 to 1300 RPM. Once the engine temperature rises to a certain level, the idle speed will decrease to the normal range. Idle refers to the state when the engine is running without any load, which occurs when the accelerator pedal is fully released during engine operation. Idle speed is one of the engine operating conditions, so its performance significantly impacts emissions, fuel consumption, and comfort. The engine speed during idle is called idle speed, which should not be too high or too low. Excessively high idle speed increases fuel consumption, while excessively low idle speed causes unstable engine operation.

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