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My 2002 Jeep Liberty is running extremely rich and both short term fuel trims are showing 99.2 with no codes

Tiny
CBOSWELL
  • MEMBER
  • 2002 JEEP LIBERTY
  • 120,000 MILES
It barely idles and is burning fuel worse a gas hog v8. I've scanned it with absolutely no luck. Any help would be greatly appreciated thanks
Friday, October 21st, 2011 AT 8:48 PM

2 Replies

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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Wednesday, October 26th, 2011 AT 10:35 AM
Tiny
CBOSWELL
  • MEMBER
  • 9 POSTS
I found out Monday that it's only running on two cylinders. Fuel pressure is 55 pounds at idle. Map kpa is around 80
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Wednesday, October 26th, 2011 AT 2:01 PM

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