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What is the ideal idle speed for an automatic transmission car?

1 Answers

VonOlivia

07/30/25 7:12am

For automatic transmission vehicles, the general idle speed range is between 500 and 850 RPM. When the vehicle speed reaches 20 km/h, you can shift to 2nd gear at 1500-2000 RPM, and when the RPM exceeds 2000, shift to 3rd gear, bringing the vehicle close to 30 km/h. Similarly, shift to 4th gear when the speed reaches 50 km/h. This is because shifting at 2000 RPM can easily cause carbon buildup, so the fuel-efficient RPM range is between 1500-2000 RPM. Car idle speed is the minimum RPM set to ensure the engine doesn't stall and runs smoothly. As long as these two conditions are met, the lower the idle speed, the better. As long as the engine runs smoothly without shaking or stalling, it's acceptable. A lower idle speed saves more fuel because the vehicle is stationary at idle, meaning no fuel is consumed for movement. A higher idle speed has only one drawback: increased fuel consumption. Most cars have an idle speed between 600-850 RPM, with 700-800 RPM being the most common. Different car models have different engine speeds and idle values due to variations in engines. Generally, the idle speed ranges from 500 to 850 RPM, while the idle speed during a cold start can be around 1500 to 2000 RPM. Once the engine coolant temperature returns to 90 degrees, the idle speed stabilizes within the specified range.

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