I put several new parts on my 91 gmc sierra and still can't keep it from flooding
Dec 12, 2010 at 2:07 PM
RASMATAZ
✓Experienced Mechanic
75,988 POSTS
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.