How to judge whether the carbon deposition of automobile engine is serious?

1. The whole exhaust pipe is black. Wipe it with a paper towel, which is covered with a lot of greasy black oil. This situation is the most serious, which proves that the engine has appeared serious carbon deposition and serious oil burning. A large number of unburned gasoline mixed exhaust gas and a large number of carbon deposits in the cylinder ran out of the exhaust valve and gathered in the entire exhaust pipe. In this case, it is best to go to the repair shop to remove carbon deposits and check fuel consumption.

2. Black pollutants are deposited under the exhaust pipe. Wipe it with a paper towel to present a dry black carbonaceous substance. This is the phenomenon of most cars that are in good condition and have been used for many years. This situation is not carbon deposition, but after a long period of driving, a small amount of gasoline that has not been completely burned by the engine becomes carbon in the exhaust pipe under the action of gravity and accumulates under the exhaust pipe. This situation proves that the engine has slight incomplete combustion and slight carbon deposition (classic car). This is not a fault and does not affect daily driving. If you can, you can go to the repair shop to clean the engine.

3. The whole exhaust pipe has a small amount of khaki dry pollutants. This is a normal phenomenon in most cars. When the engine is running, there will be some slight incomplete combustion. These gasoline will burn in the exhaust pipe (don't be afraid, it won't burn, the amount of gasoline is too small, and the combustion is only enough to directly carbonize gasoline) and then stay in the exhaust pipe. This situation does not need any treatment, and the engine is normal.

4. There is almost no pollutant in the whole exhaust pipe, and it is very clean to touch the exhaust pipe by hand. Congratulations, when you see this situation, it proves that the engine of your car is in very good condition, basically in the new car factory stage, and the engine has no incomplete combustion and no minor problems that affect the engine efficiency. This kind of engine is in excellent condition, please continue to maintain it normally.