What are the effects of leaving the car running all night?

[SanMiles]

Leaving the car running all night has the following effects: 1. Carbon buildup: If the car remains idling for a long time, the engine takes longer to reach its normal operating temperature. This leads to an incorrect fuel-to-air mixture ratio, resulting in incomplete combustion and carbon buildup in the engine. 2. Increased fuel consumption: Prolonged idling causes carbon buildup, and excessive carbon deposits can further increase the car's fuel consumption. If you notice a rise in your car's fuel consumption, it's advisable to check whether the engine has too much carbon buildup. Additionally, since the engine runs continuously all night, it consumes fuel from the car's tank.