What Happens If a Car Is Left Idling for 7 Hours Without Turning Off?

1 Answers
SanKyle
07/29/25 1:20pm
Leaving the engine idling for an extended period can be harmful to the engine. When the car is parked with the engine running, it operates at idle speed, where the throttle opening is very small. This results in a low air content in the combustible mixture, leading to incomplete combustion and the formation of carbon deposits. Prolonged idling without turning off the engine can increase carbon buildup inside the engine. Below are some key points about idling: 1. Explanation One: Idling refers to the engine running without any load, only overcoming the internal friction resistance of its components, without delivering any external power. The minimum stable operating speed under these conditions is called idle speed, which is one of the five basic operating states of an engine. 2. Explanation Two: When adjusting the idle speed, the RPM should not fluctuate abruptly, as this can cause premature wear to the engine. Additionally, if you rest in the car for a long time with the air conditioning on and set to recirculate, the air quality inside the car will become increasingly polluted, with harmful gases gradually accumulating, posing risks to health and even life safety. Please exercise caution.
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