What Causes Weak Acceleration After Car Maintenance?

[VonJake]

Reasons for weak car acceleration include carbon buildup issues and fuel system problems. Here are the specific details: Carbon Buildup Issues: This includes cylinder carbon deposits, throttle valve carbon deposits, spark plug carbon deposits, and intake carbon deposits. These components are directly related to the engine's power output. When excessive carbon accumulates inside the engine, it reduces the ignition energy, decreases intake efficiency, and ultimately leads to reduced engine power, resulting in weak acceleration and muffled engine sounds. Fuel System: Using incompatible fuel octane ratings can decrease the car's power output and reduce performance. Alternatively, if the fuel tank vent hole is blocked, or if components such as the fuel tank switch, fuel filter, or fuel lines between the tank and carburetor are partially clogged, the required fuel supply may not be met. This can lead to an overly lean air-fuel mixture and cause weak engine acceleration.