1994 Nissan Pathfinder rough idle, very rich condition once

1994 NISSAN PATHFINDER
118,000 MILES • 6 CYL • 4WD • MANUAL
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FMF
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  • 1 POST
The pathfinder starts fine, idles great, and runs great when cold. Once it reaches operating temperature, it will barely idle, smells very very rich, and runs very rough under 2500 rpms. I'm having trouble pulling codes, but I'm thinking O2 sensor? I plan on checking the MAF sensor tonight, its got a cold air intake and I recently cleaned and oiled the air filter when I changed all plugs, wires, oil, filter.
Feb 25, 2010 at 8:31 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Hi fmf, Welcome to 2carpros and TY for the donation

Your probable causes here could be the oxygen sensor, leaking injectors and fuel pressure regulator, clogged fuel return line, and out of calibration coolant temperature sensor-
Feb 25, 2010 at 9:32 AM
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