What's the effect of carbon deposition in throttle on cars?

Carbon deposition in the automobile intake valve has the following effects: 1. When carbon adheres to the intake and exhaust valves, the intake and exhaust valves are not tightly closed, which leads to the pressure drop of the engine cylinder, which directly leads to the difficulty of engine starting and idling jitter, and affects the cross section of the mixture entering the combustion chamber. Carbon deposition will absorb a certain amount of mixed gas, thus reducing engine power; 2. When carbon adheres to the top of the cylinder and piston, the volume (space) of the combustion chamber will be reduced and the compression ratio of the cylinder will be increased. Too high compression ratio will lead to premature combustion of the engine (solid engine knocking) and reduce power; 3. The carbon deposit is attached to the spark plug, which affects the quality of the spark, even the spark does not jump; 4. When carbon is formed between piston rings, the piston rings are easily stuck, resulting in strain of fuel and cylinder wall.