What are the hazards of parking in P gear without turning off the engine?
2 Answers
Parking in P gear without turning off the engine can damage the transmission and engine. Here is the relevant introduction: 1. P gear: P gear mechanically locks the output shaft of the transmission to secure the car, preventing it from moving. 2. Harm of not turning off the engine: The prolonged contact time between the combustion gas in the cylinder and the cylinder wall increases heat loss, leading to higher fuel consumption in the engine. For gasoline engines, the weaker intake airflow at idle makes it harder for the carburetor to disperse the fuel mist, requiring a richer air-fuel mixture, which may also increase fuel consumption.
After driving for so many years, I particularly enjoy studying car maintenance details. Leaving the car in P gear without turning off the engine poses significant risks. Not only does idling consume fuel and waste money, but it also increases emissions and pollutes the environment. The transmission locking mechanism may get damaged, especially on uneven roads or when external force is applied, potentially leading to premature gear wear and costly repairs. Engine cooling efficiency drops during idle, increasing the risk of overheating or even part failures. Long-term idling spikes fuel consumption and deteriorates vehicle condition. It’s better to turn off the engine during short stops and use electronic devices instead of the AC. Developing good habits extends car lifespan and is more eco-friendly—far better than expensive repairs later.
