What does it mean to keep the engine running while parked?

[Paislee]

Keeping the engine running while parked means stopping the vehicle and allowing the engine to remain in an idle state. Typically, this is only necessary when the engine shows signs of overheating, as it allows the coolant to continue circulating and dissipating heat. Another scenario is when the battery charge is insufficient, requiring the engine to idle for a period to recharge. Idling refers to the engine running without performing work, operating under no-load conditions where the clutch is engaged, the transmission is in neutral, and for vehicles with carburetor fuel systems, the choke should be fully open with the throttle pedal completely released. Engine idle performance is a crucial indicator for evaluating engine performance.