Black smoke coming out in the muffler - 2001 Kia Rio

black smoke is excess fuel entering the cylinders. and does not burn completely. poor fuel milage is also a complaint of black smoke from tailpipe.check your O2 sensor, your MAF sensor and for vacuum leaks. Could be air intake check your air filter, but probably the O2 sensor.The O2 sensor. located on the exhaust pipe prior to the muffler, looks like a spark plug with a wire that comes off the tip and leads into the wire loom.But the 02 sensor will turn the check engine light on.other intake components like sensors, fuel injectors and the fuel-pressure regulator.should be checked. good-day!

p0302 is a misfire in cylinder number 2 white smoke could be from coolant so if the head gasket is blown coolant can leak into the cylinder and cause the misfire are you loosing coolant that might be where its going

Possible timing chain stretched putting engine timing slightly out causing fuel not to burn properly . And the noise could be the chain slapping about .

are you sure that it is smoke ? it may be steam which would indicate a blown head gasket or cracked head, usually if the engine is getting too much fuel the smoke is black & if it is burning oil it is blue, if it is steam it will dissipate into the atmosphere very quickly, but blue or black smoke will linger for a while, you need to be certain exactly what it is before you can take any action to repair the problem......hope this helps......cheers.

One potential cause is too much gas. It may be running "rich". Your car may also be burning a little oil. White smoke is water or antifreeze. If you are loosing coolant from the radiator, it's probably a blown head gasket. If not, it is just condensation in the exhaust pipe that is evaporating as the pipes heat up. If the car is running too rich, the unburned gas will cause black smoke and burning oil smoke will be blue.

Hope helps (remember rated this).

White smoke is water. Blue smoke is oil. Black smoke is excessive fuel.

Well is the smoke coming out the exhaust BLUE or BLACK if Blue then its due to engine burning oil ..ie,,Piston rings /Valve seals etc etc
If Black then its fuel to much fuel going in engine and not being burnt.
So let me know more infomation and what colour smoke it is then we can get the problem sorted..
Ron

I would take it to a shop and have some general routine maintence done on it fluids, filters, spark plugs, etc.

Of course use the brake, also the map sensor could be bad.