What causes a low idle?
What causes a low idle? When you notice your car idling low, suspect three common sources of trouble: Faulty or clogged idle air control valve. Vacuum leaks. Ignition system problems. When does the idle air control valve stall? However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem. In cases where this valve is clogged or is nearing its replacement age, your vehicle will stall instead of idling after the release of the throttle. What causes a car to stall...