SPONSORED LINKS

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

DOES THIS HELP?

THE MEDIC
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
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.
Was this
answer
helpful?
Yes
No
+1
Friday, July 29th, 2011 AT 8:48 PM

Please login or register to post a reply.

Related Engine Rich Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Engine Running Rich
GUIDE
Engine Running Rich
This guide was created to show you what can cause an automotive engine to have a rich fuel mixture, which may cause black smoke to be released form the exhaust tail pipe as...
VIEW MORE

Sponsored links