Why does the car accelerate normally when cold but lose power when warmed up?

[KimberlyMarie]

This situation where the car accelerates normally when cold but loses power when warmed up is generally caused by poor signals from the coolant temperature sensor or carbon buildup in the intake system. It is recommended to first check the coolant temperature sensor at a repair shop. Possible reasons for normal acceleration when cold but power loss when warmed up include: 1. Engine mechanical system failure: such as low cylinder pressure leading to reduced engine power, which is more pronounced when the engine is cold, or excessive carbon buildup on intake valves and intake pipes; 2. Excessive carbon buildup on intake valves and intake pipes: causing the injected gasoline to be absorbed by the carbon deposits instead of entering the combustion chamber; 3. Engine management system failure: such as incorrect signals from coolant temperature or intake air temperature sensors, or circuit faults.