Aug 27, 2016. #16. Start-stop is harder on the engine (bearings) than idling would ever be. Every time you stop the engine, especially hen hot, the flywheel end main bearing sits down hard on the bottom shell of the last main, and the accessory belt end is lifted pretty hard against the top shell of the front bearing.
Engine wear is not a major concern because there is an electric oil pump that keeps everything lubricated and optimal for ignition and take off. Battery wear should increase slightly, but they put a beefier battery to account for idle stop, and have a threshold to turn on the engine if it's getting to low (to protect the battery) . Same with
Idling reduces your vehicle’s fuel economy, costs you money, and creates pollution. Idling for more than 10 seconds uses more fuel and produces more emissions that contribute to smog and climate change than stopping and restarting your engine does. Researchers estimate that idling from heavy-duty and light-duty vehicles combined wastes about
The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on

Air filter/PCV valve. Always check the air filter and PCV valve first. A clogged air filter starves an engine of much-needed air, skewing the air/fuel mixture. On the other hand, a stuck or dirty PCV valve allows too much air into the engine. Both will cause your engine to idle roughly or stall when idling.

REDUCING IDLE TIME INCREASES FUEL ECONOMY. When a truck is stopped and idling, it is achieving zero miles per gallon. In fact, it burns through about a gallon per hour, decreasing overall fuel economy by 1 percent. Idle fuel consumption increases exponentially with engine speed, so fleets should implement practices to select the lowest possible
\nidling vs idling stop
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