I put several new parts on my 91 gmc sierra and still can't keep it from flooding
Sunday, December 12th, 2010 AT 10:07 PM
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.