If it is a white cloud like steam, check the plastic tank to see if the coolant level is low. There is a small bypass hose that comes out of the thermostat housing into the block, about a 1/4" dia hose. That is notorious for leaking coolant. The thing is if you run the engine and look under the hood you may not see if leaking. I had to grab the throttle and goose it before the the slit opened up and I could find the leak. When idling, the slit was closed and no leak. However as soon as power was applied, ir sprayed like a hose.
If it smells like oil, the you have oil leaking and hitting the exhaust. Check your oil level to see if it is going down.
Edited by MR_Loyale, 06 May 2014 - 02:32 AM.