What is Ford F-150 ECO mode?
What is Ford F-150 ECO mode? Eco mode monitors driving characteristics, such as gear shift and speed, and adjusts the engine and transmission performance to help maximize fuel efficiency. The Eco driving style also lowers your stress level and environmental impact. If you drive your car in eco mode, you are not automatically traveling slowly. Why does my truck rev up and down? The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate. A vacuum leak, sensor that has failed, or...