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Question 5299

Is it advisable to do a thorough inspection of our vehicle's condition if the smoke coming from the exhaust pipe is black?

  1. No, because it is only a cooling problem that usually goes away.
  2. Yes, because in this case it may be due to poor combustion.
  3. Yes, because the engine may be burning too much oil.
Show answer and explanation

Correct answer: Yes, because in this case it may be due to poor combustion.

Yes. Black smoke appears when fuel burns poorly because the mixture has too much fuel or too little air, for example, because of a dirty air filter. Have the engine and fuel supply system checked. When the engine burns oil, the smoke is bluish-white, and if coolant enters the cylinders, it is white. In the image, black smoke comes out of the exhaust.

Manual II. Cuestiones de Seguridad Vial, edición 2026