What are the symptoms of incomplete engine combustion?

[Madeline]

Engine incomplete combustion symptoms are: 1. Insufficient vehicle power, slow acceleration and decreasing power; 2. Strong and pungent odor from the exhaust pipe; 3. Black or white smoke from the exhaust pipe. The function of the engine is: to convert the thermal energy of gasoline into mechanical energy by burning and expanding gas in a sealed cylinder to push the piston to do work. Engine maintenance methods: 1. Use high-quality engine oil; 2. Use qualified coolant; 3. Regularly clean the scale in the radiator; 4. Regularly remove carbon deposits from the car; 5. Replace the car's air filter, oil filter, and fuel filter on time.