You know we can't see or hear it so anything is going to be a guess, and it's going to be wrong. If I threw my dart at the answer board, it would say the oil filter ruptured, you didn't notice the warning light or gauge on the dash that the oil pressure was low, the hydraulic lifters started to clatter causing the tin can sound, but you kept on driving. The oil sprayed onto a hot exhaust manifold causing the smoke.
If I'm right, or something similar happened, it is possible there is no serious engine damage yet, depending on how long the engine ran with little or no oil pressure. When the warning light turns on you must stop the engine immediately, and coast to the side of the road. Major engine damage can occur in just a few seconds.
My second dart would say the serpentine drive belt snapped and you didn't see by the dash gauge that the engine was overheating. You have an engine problem but didn't say which engine you have, so I don't know how the water pump is driven. If it's driven by the serpentine belt, the engine would overheat and that smoke you saw would be engine coolant. It would expand into the reservoir where it would eventually overflow onto the ground. There's a much smaller chance of doing serious engine damage with that. Replace the belt, refill the coolant, and chances are that's all that will be needed.
You need someone to actually look at it to see what happened. Also, if the belt broke, you won't have power steering assist. That is easy to not notice at highway speeds but you'll definitely feel the hard steering at low speeds.
Tuesday, November 26th, 2013 AT 6:06 PM