Does Keeping the Engine Idling for a Long Time Damage the Car?

[DiJosephine]

Keeping the engine idling for a long time can damage the car, with effects including shortening the engine's lifespan; easily burning out the three-way catalytic converter; increasing engine carbon deposits; damaging the vehicle's electronic systems; causing fuel injector failures; and increasing the risk of freeze blockage. Engine idling is an operational condition where the engine runs without load, only overcoming the frictional resistance of internal components, without delivering power externally, maintaining a lower stable operating speed. The idle speed can be adjusted by altering the throttle opening and the idle fuel supply. Adjusting the idle speed must be done under normal conditions, including normal engine temperature, appropriate valve clearance, normal ignition system condition, good sealing of all pipelines, fully open choke valve, and tightly closed throttle. During adjustment, first unscrew the throttle opening adjustment screw to achieve the lowest stable engine speed.

[ORachel]

Keeping the engine idling for a long time without moving is indeed bad for the car. As a professional who frequently repairs vehicles, I've seen many cases. When the engine is idling, components are insufficiently lubricated, internal oil pressure is low, which can easily increase metal wear, and carbon deposits form more quickly, leading to reduced power. Especially, the cooling system cannot effectively dissipate heat, and in summer, it may even overheat, causing more severe damage. It also consumes more fuel, wasting money. I recommend avoiding prolonged idling whenever possible; if it exceeds 10 minutes, turn off the engine and wait. Regular maintenance should include checking the engine oil and air filter to keep them in good condition and extend the car's lifespan. Occasional short-term idling is fine, but don't do it too frequently.

[McFelicity]

As an experienced driver with many years behind the wheel, I often idle my car while waiting, but from experience I can say it definitely harms the vehicle. Prolonged idling makes the engine sound louder and acceleration less smooth. Later, during repairs, I found the spark plugs completely covered in carbon deposits, costing me a significant amount in maintenance. This is especially true in winter or summer when using air conditioning, as the load on the engine increases, making problems more likely. The solution is to minimize idling time—for instance, don't idle for more than a few minutes at red lights or during short stops, and make it a habit to turn off the engine. This not only protects your car but also saves fuel and money—why not do it? Don't wait until repairs are needed to regret it.

[MacDante]

As an environmentally conscious individual, I believe prolonged idling not only harms vehicle health but also wastes resources and increases air pollution. During idling, the engine continuously burns fuel without generating power, which can lead to carbon buildup and overheating risks, while emitting large amounts of harmful gases that are unfriendly to the environment. I recommend minimizing such behavior and turning off the engine promptly to conserve energy, which benefits us all. Protecting the Earth starts with small details.

[McGarrett]

As a seasoned driver, I used to idle my old car for long chats, but modern engines are more sophisticated, and prolonged idling is definitely harmful. It causes uneven internal temperatures, increases wear and tear, and drains the battery prematurely. After experiencing similar issues, I now only let the engine run for a minute or two when stationary, shutting it off if it exceeds that. Maintenance tips include regular throttle body cleaning and wiring inspections to prevent major overhauls. Safety first—don't lose big for small gains.