Carbon deposition in the combustion chamber will increase the compression ratio of the engine, and if the compression ratio increases, the car will knock more, knock the cylinder with abnormal noise, and accelerate weakly.
Carbon deposition mainly covers the piston crown, the top and head of intake and exhaust valves, spark plug electrodes, fuel injection nozzles and combustion chambers. It is the existence of carbon deposition that causes the engine to have adverse phenomena such as increased compression ratio, poor heat dissipation, poor spark plug ignition, lax valve closure, and some even reverse to the intake pipe and throttle body when the intake valve is opened, which affects the work of the engine and reduces the performance of the engine.
What is more serious is that if there is too much carbon deposition, the chunks will fall off when the engine is working, which will increase the abnormal wear of the engine and even "cylinder pulling". At the same time, it will damage the oxygen sensor and block the three-way catalytic converter