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Driving the car normally and avoiding hard acceleration brings the engine to a warmer temperature faster, and also reduces wear and exhaust emissions. Naturally, a little longer idle time is ok in winter while you clear snow and ice from the windshield and other car parts. Carburetors mix gasoline and air to vaporize fuel in order to run an engine, but they don't have sensors that tweak the amount of fuel when it's cold.
Instead, they use a mechanical system called a choke to temporarily restrict the air intake and run a richer mixture. This is a crude way to adjust the air-fuel ratio, and anyone with a carbureted engine can attest that it's hard to drive under load when the carb is choked.
It's easy to stray too rich on the mixture and foul your spark plugs. Because of this, you need to let older cars warm up before driving or they will stall out but keep in mind that carbureted engines were already on their way out by the s.
Modern cars use sensors to adjust fuel consumption , and idling simply doesn't warm the engine enough for those sensors to respond. An internal combustion engine works by using pistons to compress a mixture of air and vaporized fuel within a cylinder.
The compressed mixture then ignites to create a combustion event—as in, a little controlled explosion that powers the engine. When your engine is cold, gasoline is less likely to evaporate and create the correct ratio of air and vaporized fuel for combustion.
Engines with electronic fuel injection have sensors that compensate for the cold by pumping more gasoline into the mixture. The engine continues to run rich in this way until it heats up to about 40 degrees Fahrenheit. You're not off the hook if your vehicle runs on diesel, either. As the World Health Organization notes, diesel is sometimes used as a solvent to clean engines, tanks, and refinery equipment.
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