White smoke and smell of eggs

black smoke indicates that it is over fuelling, probably from a faulty injector
the eggs smell is hydrogen sulphide ( rotten egg gas) and is the cat converter doing its job ( same as new car exhaust smell)

smoke usually means the piston rings are bad...try an additive to slow down the smoke if possible...

Rotten egg smell is your cateladic converter... part of your exhaust pipe... should go away in a month.... the smoke coming from your oil is natural... as the oil heats up it can smoke a little... kind of a wisp... anymore then that you should get it checked.... park the rig on a large white sheet and check in a day for oil spots, if you see some isolate the area, a lot of times it can come from a loose oil filter, or oil plug but some times it comes from a worn seal. also check that the pvc valve isn't worn.... then if they are all ok I would be thinking the engine is burning it...ps. it is important to use the right weight of oil for the temperature... too thin burns off, too thick over works the oil pump and rings on the piston. stay away from the cleaners unless you are changing the oil, I use a product called sea foam personally. Good luck

overheating? low oil in crank case?low coolant ,maybe have catalytic converter checked if smells like rotten eggs!!!

You don't mention what that smell is reminiscent of?

You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?

You don't mention whether the road behaviour/performance is normal?

White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.

Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.

Burning oil smells a bit like burned eggs in the frying pan.

If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...

check the compression in all cellenders you might have a blown head gasket, burning smell might be the gas in blown cillender not igniting

white smoke out off exhaust is coolant getting into cyl like a bad head gasket to much fuel would be black smoke

check the exhaust manifold possible gasket,check flange gasket or check exhaust system for damage --cat converter smells like rotten eggs or if plugs up stalls vehicle and wont let start-----

thats the 02 sensor maybe, or the gas mix is too lean

Not sure if engine coolant smells like rotten egs when it burns inside the cylinders , but it sounds like you may have blown a head gasket. Coolant and/or oil could be getting inside combustion chamber. Another possibility is that the catyletic converter might have broken up and colapsed onto the screen where it goes into the exhaust. Might give the rotten egg smell and block the exhaust enough to cause backpressure sufficient to cause the engine to run poorly too.
Try putting your palm over the exhaust pipe , if the exhaust is coming out in pulses (pop ,pop,pop) thats normal , if it is just slowly flowing out with no noticable pulses , I would check into the cat converter problem.