Your catilitic converter may be plugged with dirt and junk. this happened to my friend's BMW 318IS. go get a universal cat at any auto parts store. it should cost you about $60. One word of advise though; don't buy a used one, it could have been stolen from someone else's car!
catalytic convertor breaking down, or exhaust touching body or chasis of car
No who, but what. All internal combustion engines emit exhaust fumes.
car exhaust or waves
A car pollutes by emitting fumes from the exhaust. The less efficient a car is, the worse the pollution is.
What can cause black sooty exhaust is bad valve guides. When the guides are bad oil leaks into the cylinder when the car isn't running. When the car starts it produces black exhaust.
You need a new Head Gasket.
no. when a head gasket is bad coolant goes to the exhaust pipe and causes the car to smoke alot all white smoke.
sulphur dy oxide......so2
That could be a leaking exhaust system. A leaking exhaust system is very dangerous! Please have it checked out ASAP.
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
If you mean the smoke it's usually related to the quality of petrol
Black smoke coming out of the exhaust of a car is usually due to oil being burned in the engine's cylinders. This can be caused by a worn piston ring or rings.