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Why your car(s) smoke black?

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If your car(s) have this  problem of black smoke and you buy fuel more than usual, then there is something wrong with it.

Incomplete combustion, in other words, fuel delivered to the combustion chamber, being more than oxygen supply and not burnt completely will cause black smoke of an  engine, prompting check engine light to illuminate and a rotten egg smell is also perceived.

This error is caused by a lambda (oxygen) sensor. Although many variables may contribute, the discussion is on lambda sensor.

What is the work of a lambda sensor?

Lambda sensor serves as the nose of a PCM (power control Module), it tells the system's computer how much oxygen is available, by sniffing, then the pcm will now determine the air/fuel ratio to use for a stoichiometric combustion.

  If the sensor sniffs more oxygen, it will send signal to pcm  and equivalent fuel will be supplied to ensure a complete burning.

What does complete burning mean in an engine?
A complete burning or combustion in an engi…