Due to incomplete combustion and carbon deposits formed in the engine, and the temperature of each part of the car is not the same, so that each component of locally produced coke is different, Generally there will be three kinds: high temperature zone coke, coke temperature zone and low temperature deposits.

The main component of the high temperature zone of coke:
1, the fuel and air in the future due to incomplete combustion of carbon-based compound produced.
2, gasoline antiknock compound.
3, non-metallic substance sulfur gasoline, through after high-temperature oxidation, and moisture in the air, forming an acid environment, easy to generate sulfates and metals.
4, an engine cylinder, valve and other metals at high temperatures is oxidized metal compound.
5, the metal due to friction metal miscellaneous debris and other impurities.
6, dust in the air.

7, the lubricant metal and the metal surface, while the engine is at a high temperature catalytic, oxidation condensation reaction, with the survival of a viscous gum (resin film), which is divided into glial meltability and infusible two kinds.

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