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Diagnostic

Tiny
TTANYA1997
  • MEMBER
  • 1996 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
What does a diagnostic test result of "fuel to rich" mean? How do we fix the problem? We've changed plugs, wires, distributor but the truck still runs rough and misses while idling.
Sunday, March 6th, 2011 AT 9:50 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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.
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Sunday, March 6th, 2011 AT 9:51 PM

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