if is the 2.3l, only when started the car,its the supercharged seal to will be replaced.
Just'n Style
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.
your car is burning oil.
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.
supercharger seals could be bad
If it is the 2.5l engine,it is probably the valve stem seals.They are notorius for drying out and cracking.On mine,after sitting over night,I would get a big puff of smoke when I put it in gear and accelerated away from a dead stop.
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.
The white smoke from the exhaust of a Mazda 6 can be caused by a number of factors. One of the factors is the lack of oil in the coolant. Another reason might be a blown head gasket.
You may have a blown head gasket.
It should. It will also run hot. It depends on how it fails. If it locks up, the belt may smoke and burn off. If it leaks, it will loose all the coolant and run hot.
Cat conv OR Head Gasket failure. Does it smell foul ? Most likely Head Gasket Leak pending failure
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.
Fouled, damaged injectors or incorrect timing on fuel injector pump