I need to know what work was done on the car, and did it seem fine when leaving the dealership? What color was the smoke coming out of the tailpipe? Also, is the check engine light on? If so, begin there by having the computer scanned for codes.
The pop sounds like a backfire, but there's no way I can be 100% sure on that. If for some reason the car was running rich (Leaking fuel injectors), enough fuel could've built up until it ignited inside the exhaust system and converter. But that wouldn't explain the smoke, because that would only smoke for a second or two until the unburned fuel cleared out. The causes of continuous smoke out of the tailpipe are oil, coolant and vary rarely transmission fluid. (Some tranny coolers are integrated with the cooling system and sometimes the fluid leaks into the coolant, then a blown head gasket will allow both to blow out the exhaust)
If you can supply me with more detail, I can help you narrow down a possible cause.
Finally, if this is a problem caused by the dealer's work, you may want to take the car back and have them look it over.
Please consider a to help us answer more questions.
Tuesday, June 11th, 2013 AT 12:24 PM