blown head gasket much?
The smoke from your muffler has a smell because what is coming out of the muffler is the products of the incomplete combustion of your fuel. Some of those products are gases and vapors that have color and some are dark but small particles - that is what you call smoke. But some of what comes out are various chemicals that your nose detects as odors.
You have described the classic symptoms of a blown head gasket or cracked cylinder head or both. In either case, there is a loss compression and "get up and go". Also, coolant leaks into the combustion chamber (also affects "get up and go" and the steam comes out of the muffler/tail pipe as "white" smoke.
Coolant is getting into the combustion chamber. Sounds like a head gasket problem.
Just having a hole in the muffler won't cause smoke to form. Any smoke coming from an engine is caused by either environment changes (white smoke while engine is warming up), or an engine burning oil (blue smoke). Sometimes even a bad catalytic converter can cause smoke. The hole in the muffler simply gives the smoke a way out. Trying looking for external oil leaks or checking he oil level occasionally to see if it is burning oil. You may see water vapor is there is a hole in the muffler but it wouldn't last long once the muffler warms up and the moisture is burned off. She shouldn't see actual smoke unless there is a problem with the engine.
You may have a blown head gasket.
The most common reason for your Pontiac to lose oil and ex smoke from the muffler is a broken piston ring. A malfunctioning exhaust valve can also cause the problem.
You may have serious engine damage. Have a mechanic look at your car.
The car might not start. If it does start, the banana might shoot out the tailpipe. If it is up in the muffler, it might smoke or burn.
White smoke indicates coolant entering the combustion chamber. STOP driving this car immediately and have this repaired or you will destroy the engine.Blue smoke indicates the engine is burning oil.Black smoke indicates an overly rich fuel/air mixture. Have this repaired or you will destroy the catalytic converter and the O2 sensor.
if its cold outside your muffler starts to smoke or it just started up or something im not sure
your car is burning oil.
It is normal and unless you are loosing coolant, I wouldn't worry about it. GoodluckJoe