What are the manifestations of carbon deposition on the intake valve After the carbon deposition on the intake valve of the engine, it will affect the idle speed and power performance of the engine. I

What are the manifestations of carbon deposition on the intake valve After the carbon deposition on the intake valve of the engine, it will affect the idle speed and power performance of the engine. In severe cases, it may also cause valve seizure, valve guide displacement, and piston top contact with the valve, etc. , causing the vehicle to fail to run normally. When the car's intake valve has carbon deposits, it will be found that the engine is running unstable and the jitter is very large. The starting performance is also poor, and the driving is weak, and after the engine reaches a certain temperature, the intake pipe will make a "chattering" noise. The car exhaust...