1991 cheverolet caprice having problems with blue smoke and egg smell and slight tapping in the engine, what do i do? I had oil and everything cleaned up with cleaner and cleaned pcv valve and the pcv and oil was filled okay now its comming out the dipstick?

White smoke is oil burning off. Try manually cleaning the filter with compressed air or at least tap it on the floor or bench to knock down the amount of dirt in it. Back to your question, not likely. Try to smell the smoke, if it smells like oil or if it smells like antifreeze.

New Piston Rings might help.

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

Blue smoke indicates engine oil being burnt, sounds like piston ring are knackered.

If it's blue smoke, your burning oil. Get the head gasket checked. If that's ok your looking at something more serious, (more expensive), inside the engine.

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...

It is probably a oil pressure problem. If there is some sort of small blockage in an oil journal it could stop oil from flowing to the lifters which would cause the the tapping noise. at this point the best thing to do would be to try and flush out the engine with some sort of desludging agent. One thing i usualy do is drain the oil and re-fill it with atf and run it for about half an hour or an hour and then re-drain and replace with normal engine oil. transmission fluid contains tonnes of detergents and should help clean out any blockages.

Greyish black smoke with a smell of burning oil means only one thing, bad rings on the piston. Major engine rebuild.

sorry to say blue smoke is oil and with what you've described sounds like the oil rings on the pistons have given up the ghost, time for a new engine or a rebuild sorry for the bad news. valve stem seals are the only other thing that will cause exhaust smoke but only when you first start the car never while running. hope i have been of some assistance.

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.