Coolant Loss and Steam from Exhaust

Nothing good.

At best, a broken head gasket.

But, it's probably a cracked head.

Worse, but not as likely is a cracked engine block.

It's time to visit a mechanic.

Is this the Toyota D4 3s-FSE Engine?

Thanks again.Yes it's the D4 engine same car. From your point of view is this repairable to good effect.

It depends on the type of damage, and if the head is warped.

If you are lucky, and the head is still flat, a gasket is easy and inexpensive (relatively)

The head likely will require machining to bring the mating surface back flat. More money.

Worse yet, the head may be cracked. It could be possible to weld the crack, machine the head and re-use it.

Worst case, you need a new head.

In all cases the head gasket will require replacement, so that cost is always there. And probably the machining cost, as well.

You and your mechanic must make the decision together.

Sounds like coolant is getting into one or more cylinders past the head gasket. It could be overheating warped the head.

As others have said, it sounds like a bad head gasket. There is little else it can be. If you keep driving it, it will get worse and possibly damage the head of the engine.

All you can do is have it towed, estimated, and repaired.

Coolant may or may not mix with oil. It depends on where the head gasket fails. If coolant gets into the oil it can, on some cars, damage bearings.

The extra power you feel unfortunately is probably your coolant leaking into your intake...Water injection has been around forever...

http://www.bankspower.com/magazines/show/690-Power-from-Water

Jets too. Not today, however.

"Turbojets -- more visceral than turbofans."

Blown head gasket for sure; possibly a cracked head. There is no good way to differentiate without removing the cylinder head. If the head is cracked, the best course is to find another in a salvage yard and have it surfaced and, for about a hundred dollars more, get a "valve job".

I'd go with the cracked head idea for the simple reason that a blown head gasket usually comes with a marked reduction in power due to compression loss.

JMHO

Mmmmmm .... depends where the blow is. It could be between the cylinder and the water channel without making it further. While it was running did you notice any seepage from the head / block joint? I guess not or you would have mentioned. Any rate, as everyone says, very probably at least a blown gasket. Tow / trailer to a mechanic, every piston compression cycle will make your probem just a tiny bit worse. Good luck! If it is a gasket & it's caught early enough it's a pain but not major bucks.

There is a possibility (I do not know exactly which car/engine this concerns), but if its one with a Turbo, I have seen a similar sounding problem, with oodles of extra power, on a Subaru of a friend of mine, the "waste gate" mechanics were hung up/damaged and he had full Turbo boost all the time......

It was actually dangerous for the engine he was later told by the company.....

Maybe the OP could post the exact model of car/engine he is asking about? Though of course, I am reading down from the top, so I may just not have read it yet.....

No doubt about it, you need a head job!

Pour a bottle of head gasket sealant from Auto-Zone into the radiator and follow instructions (varies from brand to brand). I tried that myself a couple of years ago and haven't regretted thus far.

It is a good thing that you understand the principles of every thing you got at hands, but it is wise to decide whether it's worth to invest a lot of money or a lot of time into something that could be fixed quickly, leaving you more spare time and extra money to enjoy life.

Besides, it is no mind challenging anymore; in the worst case you'll incur in the same expenses you were trying to avoid.