What is the normal idle speed for an automatic transmission?

1 Answers
DeJack
07/30/25 4:08am
Under normal conditions, the idle speed for an automatic transmission car is 700-800 RPM. Below are the specific details about car idle speed: 1. High idle speed: The hazards of high idle speed include increased fuel consumption, elevated engine operating temperature, and accelerated machine wear. 2. Low idle speed: The hazards of low idle speed include stalling during startup, which can damage the engine and starter if frequent restarts occur. Additionally, excessively low idle speed may lead to stalling while driving, and long-term operation can cause carbon buildup inside the engine cylinders, resulting in sluggish acceleration. 3. Prerequisites for idle speed adjustment: The engine temperature should be normal, valve clearance appropriate, ignition system functioning properly, all pipelines well-sealed, choke fully open, throttle able to close tightly, etc.
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