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.Continue Reading
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.Learn more about Car Parts & Maintenance
If a car jerks while driving, this is a strong sign of engine trouble. It could be caused by a spark plug malfunction, clogged fuel lines or fuel filter, a glitch in the vehicle's computer or from many other issues, according to HowStuffWorks. Regular oil changes and other preventative measures help to keep this from happening.Full Answer >
A smell of sulfur coming from a car's exhaust pipe is a good sign that there is a problem with the catalytic converter, according to Cars Direct. The smell, similar to rotten eggs, indicates that the sulfur present in gasoline is not being converted to odorless sulfur dioxide.Full Answer >
In a typical car, the catalytic converter is part of the exhaust system and under the car, between the engine and the muffler. Often manufacturers locate the catalytic converter under the passenger seat. On long trips, passengers sometimes feel the heat it produces at their feet.Full Answer >
A true dual-exhaust system helps to improve the performance of a V-6 or V-8 engine by splitting the exhaust from the two banks of cylinders. However, it is less effective on smaller vehicles that use an inline four-cylinder engine. The system reduces the pressure to expel the exhaust fumes, allowing the engine to send more energy to the transmission.Full Answer >