Why is my cadillac 4.5 engine smoking

SOURCE: OIL IN AIR CLEANER PUDDLED UNTIL

get the car warmed up and let idle and pull the pvc hose out and watch how much smoke is comming out of the valve cover. then rev it up and see how much comes out. it sure soulnd like blow by to me.

SOURCE: 88 rx7 13b twin rotary

Sounds like you have a cracked block between the water jacket and the combustion chamber.Did you ave a warranty on the rebuild?

SOURCE: My 95 Honda Civic dx (revving up and down)

sounds like you might of blown a head or intake manifold gasket or cracked head. If it sounds like a rollercoaster going up the tracks or tractor sound. it's that. It's expensive repair. My advice if you dont know anyone cheap get another used car until you fix it or whatever your situation is. Also, it idles up and down because of the air escaping from the crack. If engine doesnt hold constant pressurethats whate happens. everything is to the T when working with vehicles. Plus redline dont matter, theres a cut off point, however because of the high rev you could of caused the over rev and blew a gasket or cracked the heads. Especially if you didnt have the proper fluids to keep the temperature down. Good Luck. Been there.

SOURCE: The engine suddenly started running rough

CHECK YOU'RE catilactic converter

SOURCE: thick oil, blue smoke from exhaust

sound like you have blown head gaskets and water getting in the oil