During normal operation, the emissions from a car's tailpipe should be invisible ... Thick white smoke: Call a tow truck Unlike the wispy white vapor described above, billowing white smoke ...

It's normal to see a small puff of white smoke coming from your tailpipe when starting your car after it sits overnight — ...

devices that clean up pollutants like excess fuel vapor to make for cleaner emissions. But a Lamborghini with a 12-cylinder engine at the back of the car only needs a short exhaust that's piping ...