If black smoke is coming out the tailpipe, it could indicate a problem with the fuel injection system, the fuel pump, the engine computer, or the carburator.
White smoke from the tailpipe can indicate water or antifreeze in the engine cylinder, meaning you have a failed head gasket.
Watch for smoke coming from your tailpipe or hood, and keep an eye out for puddles under your car.
Periodically check the car's front grill vents and tailpipe to eliminate clogs.
Blue smoke coming out the tailpipe may mean a failing gasket, O-ring, or seal.