What Causes Normal Cold Start but Weak Acceleration When Warm?

[GabrielleFitz]

The reasons for normal cold start but weak acceleration when warm are as follows: 1. Carbon deposits: Excessive carbon buildup inside the engine reduces ignition energy and intake efficiency, leading to decreased engine power and weak acceleration; 2. Fuel system issues: Using mismatched fuel octane ratings or having blocked fuel tank vent holes, partially clogged fuel lines between the tank switch and fuel filter can restrict fuel supply, resulting in lean air-fuel mixture and weak engine acceleration; 3. Air intake system problems: As air is one of the engine's power sources, prolonged use without cleaning the air filter can cause blockage. Insufficient air volume leads to over-rich combustible mixture, reducing engine power; 4. Engine overheating: Insufficient engine oil, low coolant levels, or faulty cooling systems increase engine load, resulting in poor heat dissipation.