Engine decarbonizer is a type of service or product that is designed to remove carbon buildup from the engine of a vehicle. Carbon buildup can occur over time as a result of incomplete combustion, and can lead to a variety of problems such as reduced engine performance, increased emissions, and poor fuel economy.

Engine decarbonizer products typically contain chemicals or solvents that break down and dissolve the carbon deposits in the engine, allowing them to be flushed out during the engine's normal operation. Some products are designed to be added to the fuel tank, while others are sprayed directly into the engine's intake system.

In addition to products, engine decarbonization can also be performed as a service by a professional mechanic or auto service center. This typically involves disassembling the engine and manually cleaning the carbon deposits from the various engine components.

Engine decarbonizer can be beneficial in improving engine performance, fuel economy, and reducing emissions. However, it should be noted that excessive carbon buildup may indicate other underlying issues with the engine, such as faulty sensors or fuel injectors, and addressing these issues may be necessary to fully resolve any engine performance problems.