What Causes Poor Acceleration and Sluggish Performance When Accelerating a Car?

[Sharon]

Possible causes of a car lacking power and poor acceleration include the following: 1. Ignition system malfunction: For example, aging ignition coils or spark plugs that have not been replaced for a long time can result in insufficient ignition energy, poor combustion, weak engine acceleration, and the illumination of the engine warning light. 2. Fuel system malfunction: A fault in the fuel system can cause excessively low pressure. Insufficient fuel injection may lead to weak engine acceleration. 3. Excessive engine carbon buildup: Too much carbon buildup in the engine can lead to poor fuel atomization, resulting in incomplete combustion, excessive exhaust emissions, and weak engine acceleration. 4. Engine system malfunction: A fault in the engine system may cause the engine to enter an emergency operating mode, thereby limiting power output and resulting in weak acceleration. Examples include sensor malfunctions such as oxygen sensors, air flow meters, crankshaft position sensors, knock sensors, etc. Signal faults from these sensors can trigger the engine's emergency mode, leading to weak acceleration.