Hi

I have a 92 toyota truck 4wd, and it has 150K miles on it. the emission recently has become smoky and it smells like the engine is burning coolant. any ideas how big the problem is? apparently this is some kino of leaks inside the engine. do I need to replace the engine, and how much would it cost? thanks so much for your inputs :)

cheers!
DC

Sounds like a blown head gasket. Have you checked the oil? Does it look like chocolate milk?
Can't guess about the costs since you haven't told us what motor you have.
Can you do the work yourself?

Dude, you need to STOP driving your vehicle and get it checked out ASAP. You can cause all kinds of serious damage to the internal components by driving with a blown head gasket dumping coolant out the exhaust and who knows what else going on inside the engine!