quite likely just burning stuff off. In fact, I read of a guy in the past that literally poured fuel out of his exhaust parts. (might be bad for cat conv ?)
doesn't take much to make huge amounts of smoke. Ask anyone who has used SeaFoam thru a vacuum line.
I'd be tempted to let it warm-up to operating temps (you might do it at night if you're afraid the neighbors will call the fire department!)
and, if it seems to still smoke/smell of fuel, pull plugs to see if one cylinder is very wet - maybe a bad injector.
if all a re wet or the car still smells like fuel, then the ECT as suggested could be the problem.
Edited by 1 Lucky Texan, 04 April 2013 - 11:19 AM.