What is the fuel consumption of a 1.6L engine idling with AC on for one hour?

1 Answers
ThomasRose
07/30/25 10:58am
Idling with the AC on consumes approximately 1.4-2.5 liters of fuel depending on the engine displacement, with an average of around 1.6 liters. While the fuel consumption is not excessive, it is detrimental to the engine, as it can lead to carbon buildup and overheating damage to the catalytic converter. Below is an introduction to idling conditions: 1. Normal Idling: When the vehicle is parked and the engine is started, the minimum stable engine speed is referred to as parking idle (the process of the engine transitioning from cold idle to normal operating temperature idle is called warm-up or hot start). 2. Driving Idle: When the car is in gear without pressing the accelerator pedal or when the accelerator pedal is released while driving, maintaining the minimum throttle opening, the engine speed matches the parking idle speed, which is referred to as driving idle. 3. Unstable Idle: Unstable idle is one of the most common issues encountered in engine maintenance. Incorrect diagnostic approaches can prolong repair times, reduce efficiency, and even cause vehicle owners to switch to another repair shop due to impatience.
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