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Running rich

Tiny
GEOFFHAHA
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 113 MILES
I just changed the spark plugs on my 03 grand cherokee 4.0l last week and the front three plugs are covered in carbon deposits where as my back three are not. What could cause that
Wednesday, July 27th, 2011 AT 9:23 PM

2 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
FOUND THIS FOR YOU

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

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Friday, July 29th, 2011 AT 8:46 PM
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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Friday, July 29th, 2011 AT 8:48 PM

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