1991 Nissan Pathfinder Bogs When Warm

1991 NISSAN PATHFINDER
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COZ PASSALACQUA
  • MEMBER
  • 1 POST
My Pathfinder bogs down, is "herky-jerkey when I try to pass or, climb a hill. I have replaced the plugs, plug wires, Distributer cap and fuel filter. NO IMPROVEMENT. This happens ONLY when the car is warmed up. When cold, it runs perfectly/
Apr 12, 2006 at 3:22 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
You have a lean condition when the computer goes into open loop. It may be a lazy O2 sensor. Have it scanned for O2 voltage in open loop. Good luck
Apr 12, 2006 at 5:21 AM

Suggested Repair

Scan the oxygen sensor voltage once the engine is warm. A lazy O2 sensor may cause a lean condition and the bogging under load.

Conversation Summary

The owner of a 1991 Nissan Pathfinder reports bogging and jerking when passing or climbing hills, only after the engine is warm. It runs normally when cold. Plugs, plug wires, distributor cap, and fuel filter were replaced with no improvement. The expert suggests a lean condition and a possible lazy oxygen sensor, and recommends scanning O2 voltage.

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