1997 Cadillac Seville Engine is not preforming and is eatin

When was the last time it seen a major tune-up?

Lets get the coolant temperatrue sensor and fuel pressure/exhaust system for restriction checked then report back.

Are you overheating and how often do you put oil in the crankcase?

Get it block and pressure tested for the overheating problem and also have the fuel pressure checked-

Spark plugs on this car are replaced at 100k, which I would also put on wires, the smoke out the tail pipe is just oil and carbon, the rings are sticking and need cleaned with a solution that cadillac knows about, they dump it in the cylinders and it cleans them it may also take a couple times. It works good

if you are smelling antifreeze you have a leak, places to look heater hoses, water pump, radiator, or heater( rub your hand on the carpet on pass side frt floor board and smell your hand) the coolant cristlizes so you may not see it unless its pooring out, never seen a head gasket leak coolant, it just overheats and blows it out the overflow jug

scan your codes for problems, off and warmer on the heater controls at the same time, with key in the on position, look at the IP for them, write them down and post them here! Stalling may be due too crank sensors

as for the starting try a fuel PSI regulator its cheap 25 - 30 bucks and easy to install. Its in the fuel rail on top of the motor, get it at the dealer, dont put thoes cheap parts on that car

not trying to scare you but you would be surprised on how many people keep driving there car even knowing its overheating, til it dies

I need the code # to help, multiple misfires I would start with wires and go from there, go to napa or the dealer for parts

Don't come in here with that attitude its uncall for and might cause you to get 86 from here

How did you know its a burned valve running on 7 pistons?

Gees buddy go to another site with that. White smoke tells me that coolant is in the cylinders. Pick up a hydocarbon test to check the coolant for signs of a leak in the engine. Poss. Leaking intake or head gasket.U can pull all the plugs and check the plugs for signs of coolant on them.