What Causes Weak Acceleration When Starting with AC On?
2 Answers
Weak acceleration when starting with AC on can be attributed to the following reasons: Increased Engine Load: Running the AC places a greater load on the engine, especially during hot summer days when fuel vapor increases relatively, leading to reduced fuel pressure within the fuel system. Insufficient fuel supply due to a clogged fuel filter can also contribute to this issue. Higher Fuel Consumption with AC: The sensation of weakness in the car primarily occurs because the engine lacks sufficient fuel during acceleration, resulting in decreased combustion efficiency. Frequent AC Use Leading to Blockages: In addition to fuel, the engine requires air. If components such as the air filter or throttle become clogged or malfunction, causing insufficient air intake, this can also result in sluggish acceleration and slow speed increase.
When starting with the AC on, the car feels sluggish. As an experienced driver, this is very common. The main reason is that the engine's power is inherently limited, and when the compressor kicks in, it takes away a portion of the power, essentially sharing the load for cooling, which naturally makes the car feel weak during acceleration. This is especially noticeable in small-displacement or older cars—it feels like the car is being held back when the AC is on in the summer. To improve overall efficiency, it's recommended to maintain the engine regularly, such as replacing spark plugs or cleaning the intake system. When accelerating, avoid stomping on the gas pedal; a gentler approach works better. If this happens frequently, take your car to the shop for a check-up—don’t let it escalate into a bigger issue that could compromise safety.
