If your car is emitting black smoke, it could indicate a leak in the area where the fuel is burning. In this case, the smoke from the vehicle is black. This usually happens when the air-fuel ratio is out of balance. Vehicles can also experience this problem due to injector leaks due to worn nozzles.
2) smoke blue
Typically, as a vehicle ages, the smoke begins to change. There will also be blue smoke. This indicates a malfunction with the engine. Explain that the vehicle emits blue smoke when the piston rings or valve guide seals are damaged. While this isn't an immediate issue, it should prompt us to get the vehicle serviced. That way the car's problems don't get worse.
3)white smoke
If you see white smoke coming from your car, it's not a good sign. Because it happens when the liquid or coolant added to cool the vehicle leaks. As a result, the car heats up very quickly. In this case, the coolant leak should be repaired at the nearest service center before the problem worsens.
Gray smoke comes out in the vehicle when more oil starts burning in the engine. Apart from this, a worn out PCV valve is also a reason for gray smoke. The PCV draws unburnt fuel from the bottom to the top of the engine.