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2002 Nissan Pathfinder Fuel Consumption

Tiny
HARPOON1976
  • MEMBER
  • 2002 NISSAN PATHFINDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 109,000 MILES
I'm having an issue with my '02 Pathfinder since having a tune-up about 6 months ago: I went from getting 16-17MPG to getting about 10-12MPG. Other then fuel consumption, the car runs absolutely great- no unusual sounds, no engine problems, etc.

I consulted with my cousin who's a mechanic for a dealership and he pulled the plugs guessing they were gapped wrong. They were slightly off so he changed them out for better plugs, but the issue is still there: crappy fuel mileage.

Not sure what the issue is now: maybe a lazy O2 sensor, clogged fuel filter? Anyone have an idea?
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Tuesday, July 28th, 2009 AT 8:11 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Has the check engine light ever come on? You sound like you have the same luck I do. Try to improve something and it gets worse.

As far as the O2 sensor, that could be a problem, but I would think the check engine light would have come on or performance wouldn't be that great. You could remove the sensor and check to see if it is carboned up. Also, I will assume that power hasn't changed indicating a potentially plugged catylatic converter.

Let me know about the O2 sensor and the check engine light.
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Wednesday, July 29th, 2009 AT 12:17 AM
Tiny
HARPOON1976
  • MEMBER
  • 4 POSTS
Check engine light has never come on and the engine power is fine. The only thing I noticed is that it's struggling a little bit going up steep inclines, but nothing major.
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Wednesday, July 29th, 2009 AT 7:37 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
I wonder if the catylatic converter is starting to plug. Have you ever notced any ratteling from that area that may indicate the insides are loose?
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Wednesday, July 29th, 2009 AT 11:50 AM
Tiny
HARPOON1976
  • MEMBER
  • 4 POSTS
Not that I've noticed at all, but I haven't been paying attention. I'll start it up and see when I get home tonight and let you know.
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Wednesday, July 29th, 2009 AT 1:10 PM
Tiny
HARPOON1976
  • MEMBER
  • 4 POSTS
Checked it this morning- doesn't sound like anything's wrong with it. Engine sounds fine.
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Thursday, July 30th, 2009 AT 8:59 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
THen chances are you are right with the O2 sensor.
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Thursday, July 30th, 2009 AT 4:39 PM

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