How to Determine if a Car Has Carbon Deposits?

[ArcherRose]

Methods to determine if a car has carbon deposits: 1. Check if there is black oil residue on the exhaust pipe; 2. See if the car is difficult to start when cold; 3. Observe if the engine idles roughly; 4. Check if acceleration is sluggish; 5. See if the exhaust emissions exceed standards; 6. Monitor if fuel consumption increases. When a car has carbon deposits, black deposits will appear on the exhaust pipe and may feel sticky to the touch. Additionally, when starting a cold engine, it may cause unstable idling, with RPM fluctuating between high and low. The car's acceleration may become slower, and the exhaust may emit a pungent odor with excessive pollutant levels due to incomplete fuel combustion. This can also lead to a sudden increase in fuel consumption. Carbon deposits include two concepts: 1. A coking substance formed from unsaturated olefins and gums in fuel under high temperatures during engine operation; 2. Carbon deposits in electrical discharge machining, which should be avoided as much as possible, especially in precision mold processing, as they can have fatal effects.