Why does my car emit black exhaust smoke?

Answer

Black smoke from a car's exhaust is a sign that the engine is running too rich. The fuel is burning with incomplete combustion, and the black cloud includes the unburned carbon compounds. The NSW EPA says this is a sign the car is not properly maintained or poorly tuned. It is creating unnecessary air pollution and costing the driver more in fuel to operate.

If the vehicle has a dirty air filter, it does not allow sufficient oxygen to reach the engine's cylinders for complete combustion. Replacing the air filter on most cars is a quick and inexpensive fix that increases fuel economy. The operator's manual includes a recommended replacement schedule.

In vehicles with a carburettor, the black smoke is often an indicator of flooding or a butterfly choke stuck in the closed position. These problems are often due to the carburettor needing service due to varnish that builds up from the fuel as it evaporates.

The color of the smoke from the exhaust gives important clues to problems with the vehicle. Once they reach normal operating temperature, gasoline vehicles should not produce smoke. When the vehicle is cold, white smoke is usually water vapor from condensation and not a reason for concern. Blue smoke from a vehicle indicates excessive wear and severe mechanical problems.

Q&A Related to "Why does my car emit black exhaust smoke?"
If there's a lot of white smoke you,ve blown a head gasket. Answer because its a ford Answer because its a ford can't say if you keep your car details a secret
http://wiki.answers.com/Q/How+do+you+stop+a+94+Lin...
It will probably fail the smog test. Black smoke is a sign of too rich fuel mixture caused by maladjusted fuel system. It could be a bad fuel pump putting out too much pressure. You'll
http://answers.yahoo.com/question/index?qid=201307...
Black smoke is caused by excess fuel that is in the cylinder area and can't be
http://www.chacha.com/question/why-does-my-car-blo...
The following steps will stop making damn
http://www.fixya.com/cars/t5016913-car_throw_black...
Explore this Topic
Any smoke coming from your car's exhaust is a cause for you to get your vehicle checked. White smoke generally reflect moisture in the exhaust system. This could ...
White smoke coming from a car's exhaust can stem from a variety of causes, the most common being condensation. Because of condensation, which occurs naturally ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com