Chrysler Repair: black smoke from tailpipe, coolant temp, engine coolant

Question
car gives black smoke when you step on gas pedal,changed map sensor,and found a vacuum with a leak and repaired.I was going to change 02 sensor,but it's tight and have to use heat on it,I checked fuel pump pressure regulator vacuum,it's o.k and no fuel in the hose.
                 
               thanks

                     mitch

Answer
Black smoke is typically the sign of unburned fuel.  Meaning the car's running rich.  I would be suspicious of the oxygen sensor.  Try spraying on PB Blaster and letting it sit for a couple of mins.  Sometimes even sitting overnight will make the difference between the part stripping vs just coming right out.

Do you have any fault codes to go on?  Running rich could be a number of things including timing, engine coolant temp sensor, stuck injectors, or a bad computer just to name a few.
Doug