Black smoke of an engine

It is not uncommon that petrol engine exhaust black smoke, following poor fuel economy. This is due to an incomplete combustion in the chamber.
If the supply of air (Oxygen) is insufficient, compared to fuel supply, it causes incomplete burning of the available fuel, and excess fuel exhausted, which causes blacky smoke of the engine, alot of fuel wasted.

Parts of the engine that causes this

  1. Airflow sensor (airflow meter)
  2. Air cleaner element, if it's clogged with dust particles
  3. Blockages of injector holes
  4. Faulty oxygen sensor
  5. Absence of fuel pump pressure regulator
Remedies

  1. Replace the airflow sensor if tested faulty, the common test for this is by racing the
    engine and noticing that the accelerometer pointer will be seen not passing 3000rpm and engine would be frustrating
  2. Dust the air cleaner element or replace it, if possible
  3. Use carb cleaner or thinner and free all the holes of the injector
  4. Clean or replace oxygen sensor, this is mostly notice by the engine displaying check engine light in the car dashboard.
  5. Most modern engines do not have fuel return line. Instead there's is a built in
    pump pressure regulator in the fuel tank. This also serves as the fuel filter of the engine, if it is being removed without replaced due to blockages, fuel fuel pump would overpump fuel into the engine compared to oxygen supply. Hence, blacky smoke  of the engine results

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