2002 Jeep Grand Cherokee

Tiny
REX CARTER
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
Hard to start backfires through throttle body exhaust smells rich
Tuesday, October 12th, 2010 AT 11:05 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 or defective fuel pressure regulator.
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 13th, 2010 AT 12:46 AM

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