What are the reasons for a sudden lack of power in a car?

[AaliyahLee]

Here are the reasons why a car may suddenly feel a lack of power: 1. Carbon deposits: Carbon deposits include those in the cylinders, throttle, spark plugs, and intake system. These areas are closely related to the engine's power output. When there is excessive carbon buildup inside the engine, the car's ignition energy and intake efficiency will decrease, resulting in engine shaking and insufficient power. 2. Fuel: Using an inappropriate fuel grade (e.g., filling 90-octane fuel in a 93-octane engine) can lead to a decrease in the car's power output. Alternatively, if the vent hole of the fuel tank cap is blocked, it may cause partial clogging of the fuel tank switch, fuel filter, or fuel lines between the tank and carburetor, leading to insufficient fuel supply. This results in an overly lean air-fuel mixture during engine operation, causing power loss. Solution: Use the appropriate fuel grade for your engine as specified, perform regular maintenance, and clean the engine's fuel system based on actual conditions. 3. Air intake: Air is one of the power sources for the engine. If the air filter is not cleaned or replaced in time after prolonged use, clogging can lead to insufficient air supply, causing an overly rich air-fuel mixture and reduced engine power. For vehicles equipped with turbochargers, a malfunction in the turbocharger can also result in power loss. Solution: Clean the air filter regularly and replace it at a 4S shop after a certain maintenance interval.