I have a 1994 chevy beretta and it blows out black smoke out of the tail pipe. I already replaced the coil pack. What else could it be?
Thursday, August 4th, 2011 AT 12:24 AM
Probable causes of an engine running rich are as follows: 1. Excessive fuel pressure can be cause by restricted fuel return line
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.