Is It a Problem If the Car Is Left Running Overnight?
2 Answers
The impact of forgetting to turn off the car overnight is as follows: 1. Carbon Deposits: In idle state, the car will continuously inject fuel. Since it remains in idle for a long time, the intake air volume is very small. On one hand, this prevents the flushing of the intake tract and related areas, and on the other hand, it leads to insufficient oxygen inside, making it easier for incomplete combustion to occur, thus increasing the likelihood of carbon deposits. 2. Engine Wear: Leaving the engine running overnight will result in prolonged idling, reducing the oil pump speed. At this time, the oil pressure is relatively low, making it difficult for components like bearing shells to be effectively lubricated, thereby exacerbating wear on the piston, connecting rod, and engine. 3. Fuel Consumption: Forgetting to turn off the car means it will remain in idle state, continuously consuming fuel. Under idle conditions, fuel consumption is obviously higher than at economical speeds. If the fuel level was already low, the vehicle might stall immediately, directly leading to an increase in average fuel consumption.
I used to be a careless driver too. Once I parked the car overnight without turning off the engine, only to find it still running the next morning and quickly shut it down. Upon inspection, half the gasoline was gone, the area near the fuel tank was warm, and there were slight signs of carbon buildup. Prolonged idling like this can accelerate engine wear, hinder oil circulation, and lead to premature component aging, shortening the vehicle's lifespan. The battery may also over-discharge, potentially causing starting difficulties. Even more concerning is the risk of carbon monoxide buildup in enclosed garages, posing a safety hazard. If this happens, immediately turn off the engine, check the fuel and electrical systems, and visit a repair shop for a comprehensive diagnosis if necessary to prevent further damage. Cultivate the habit of double-checking before leaving the car to avoid such troubles.
