Is Direct Injection Carbon Buildup Severe?

[DiAlexandra]

Direct injection engines experience more severe carbon buildup issues compared to conventional port fuel injection engines. For port fuel injection engines, the engine draws in a combustible air-fuel mixture. During the intake process, gasoline molecules in the combustible mixture help clean the engine's intake passages and valves—key areas prone to carbon buildup—to some extent. Therefore, carbon buildup is not a significant issue for port fuel injection engines. Methods for removing carbon deposits from car engines are as follows: 1. Additive Cleaning (Fuel Additives): Additive cleaning involves directly adding a cleaning agent to the fuel tank to mix with the fuel. When the vehicle starts, the cleaning agent enters the combustion chamber along with the fuel and cleans the carbon deposits inside the engine to a certain degree. 2. Drip Cleaning: Drip cleaning, commonly known as no-disassembly cleaning, is a cleaning method currently promoted by many 4S shops. This method uses a drip system to introduce the cleaning agent into the engine's intake pipe, where it is drawn into the combustion chamber along with the intake airflow. During this process, the cleaning agent cleans carbon deposits in the intake passages and combustion chamber. 3. Disassembly Cleaning: As the name suggests, disassembly cleaning involves removing parts of the engine with carbon buildup for thorough cleaning. Although this method provides the best cleaning results, it is labor-intensive and time-consuming, so most 4S shops do not offer this service.