How much should you rev a car on idle?
How much should you rev a car on idle? Typically, engines idle at about 600-800 rpm. Older engines may go up to 1200 rpm or more while warming up. But if the engine is revving up while idling, even after it's sufficiently warmed up, you might have a problem. High idle speeds waste fuel, cause extra wear and tear on your engine, and can be unsafe as well. Can a dirty idle circuit not accelerate under load? A dirty idle circuit can idle fine and rev like crazy, but bog and die as soon as the throttle is opened while...