What is the appropriate engine RPM for car starting?

1 Answers
CarterDella
07/29/25 9:16pm
When starting a car, the engine speed is generally appropriate at 700-800 RPM. Higher RPM leads to increased fuel consumption, and as long as there is no shaking, design engineers prefer to keep it as low as possible for fuel efficiency. Below is an introduction to related engine knowledge: Conditions causing automatic idle speed increase: Cold start, low water temperature, battery discharge, turning on air conditioning for cooling. Hazards of unstable idle speed: Excessively high car idle speed requires checking if the intake manifold is loose or leaking, which can significantly increase fuel costs and also promote engine carbon buildup. Excessively low car idle speed poses a safety hazard of stalling while driving.
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