How serious is the carbon deposition in Fit?

The problem of carbon deposition in Fit is still serious, and the harm caused by carbon deposition in engine combustion chamber: 1. After the engine deposits carbon, the engine power will decrease. Before driving, it feels that the car is not driving, and there is a feeling of no throttle, which will promote the decline of engine power and economy. It is not only difficult to drive, but also consumes oil, which has a great impact on automobile emissions. 2. Carbon deposits will be formed after the intake and exhaust of the engine, especially the exhaust valve is easy to cause a "secondary valve" because the carbon attached to the exhaust valve will hinder the heat dissipation of the exhaust valve. Although the exhaust valve is treated by special technology, it can't avoid heat dissipation when the carbon deposition temperature is too high. 3. The carbon produced by the piston head is easy to form multiple ignition points when the engine is burning, so that insufficient combustion in the cylinder causes knocking, the engine power decreases, and in serious cases, it may lead to cylinder pulling.