What does dark exhaust mean?

Black exhaust smoke can appear when the vehicle is burning too much fuel. This could be caused by a clogged air filter, malfunctioning fuel injection system, a blocked manifold, or a variety of other issues. Have your vehicle checked out by a technician to see why your vehicle is burning more fuel than usual.

What causes discoloration on motorcycle exhaust pipes?

There is a simple reason your motorcycle exhaust pipes might have turned blue. Essentially, the metal becomes discolored as a result of the heat of the exhaust going through the pipes. Heat turns chrome blue, but if your exhaust pipe is made of stainless steel, the excessive heat will turn it golden color.

Should the inside of my exhaust be black?

TOM: Modern cars all have at least two oxygen sensors that check the mixture by measuring how much oxygen is in the exhaust. RAY: So whatever caused the inside of your exhaust pipe to turn black, unless your check engine light is on, is unlikely to be a fuel-air mixture that’s too rich.

What does Black smoke from motorcycle exhaust mean?

Black or gray smoke often indicates a clogged air filter or your bike is running too rich. If you have a motorcycle with a carburetor, you need to adjust the jetting. If your motorcycle is fuel injected, the fuel return line might be clogged or something is wrong with your injectors.

Why do exhaust pipes change color?

The exhaust pipes are designed to withstand heat, however if there is too much heat with soaring temperatures, the exhaust pipe metal starts coloring. The coloring is because of an oxidized layer forming on the surface of the metal exhaust pipe. The metal has higher oxidization temperatures.

Why is my exhaust making my bumper black?

Black soot is a sign of a rich condition, to much fuel…. Pull your spark plugs they are probally black too. more air, means more fuel, not much on an un-tuned engine, but enough that you could get build up on the exhaust/bumper.