What Causes Poor Engine Acceleration?

[Carolyn]

When the engine experiences poor acceleration, the engine speed fails to increase immediately after the driver presses the accelerator pedal, resulting in a lagging phenomenon. Alternatively, slight fluctuations in engine performance may occur during acceleration, leading to insufficient engine power. The causes of engine malfunction include: 1. Poor-quality gasoline: Low-quality gasoline not only causes incomplete combustion of the air-fuel mixture in the cylinders but also leads to excessive carbon buildup, potentially clogging fuel lines and corroding components. It also affects the normal concentration of the air-fuel mixture, ultimately causing engine malfunction accompanied by shaking and vibration. 2. Damaged oxygen sensor or sensor connector: A faulty oxygen sensor or a damaged/loose sensor connector can result in an overly lean or rich air-fuel mixture, leading to engine malfunction. 3. Spark plug carbon buildup: Carbon deposits on spark plugs can cause poor engine performance, manifesting as difficulty starting, unstable idling, poor acceleration, backfiring during sudden acceleration, excessive exhaust emissions, and increased fuel consumption.