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abertooth

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About abertooth

  • Birthday 06/15/1981

Previous Fields

  • Your Pathfinder Info
    1991 Pathfinder SE-V6 Auto
  • Mechanical Skill Level
    Standalone Tool Chest Mechanic
  • Your Age
    30-35
  • What do you consider yourself?
    Weekend Warrior
  • Model
    SE
  • Year
    1991

Profile Information

  • Gender
    Male
  • Location
    Breckenridge, CO
  • Country
    United States

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  1. So, today I swapped out the coolant temp sensor because it was a cheap part not really worth my time to test the old one. Checked continuity in the harness. Seemed fine. Took it for a spin and it did the same old dance. Limped it home. No new codes. Went for a ski while it cooled down, went back to start it again and it ran like crap. Started rough, low idle, jumpy tach. It seems like it may be getting progressively worse all around. Next I'm going to test the O2 sensor. Up here at 10,000 feet we only get a couple good hours per day to work outside before the temp drops, so I basically get one thing tested per day. Kind of frustrating. Can anybody tell me which harness on the passenger fender is the one for the O2 sensor? Also, digging out my infrared thermometer to test the cat tomorrow. I would agree with slartibartfast that it didn't seem like a cat problem but its a pretty quick test so i'll check it anyway. Thanks for your comments everybody!
  2. Hi adamzan, I've read a lot of your posts on my journey through the EF and EC systems of this thing. Thanks for your thoughts. I have a coolant temp sensor coming in the morning. Fingers crossed that I get out of this with a $15 part. Today I checked some of the plugs to look for information that way. I also checked that the MAF was working. All good there. Verified that all vacuum hoses are in good condition. Cleared any codes from the ECU and took it out for a ride to get it to run rough and see if it threw a new code. It ran rough, didn't like high RPMs when I stepped on it and it gradually deteriorated to just sputtering enough to get home. Some observations from the test ride: It started and ran great cold as usual, as it got warmer, it liked high RPMs less and less until I had almost no power. As the performance got worse I got some small backfires and then legitimate sputtering (just enough power to get it parked). The Tach was also jumping around once it got real bad. It definitely felt like it was misfiring. From some of the things that I read it sounds like the Camshaft Position Sensor could have a part in this. What's your take on this?
  3. Hi guys, thanks for the replies. To answer your questions: No it doesn't die when braking or slowing to turn, no black smoke. It will keep running but get very low power and some sputter and it gradually gets worse. I am not sure its in time. It had a timing belt service not too long ago. I guess it could have gone out of time but it started very suddenly. What could cause it to go out of time suddenly like that? Are you talking about the O2 sensor before the Cat? What gets me is that it runs great until it reaches temp. I feel like if it were the plugs and/or wires or the timing, it would show signs all of the time and when starting.
  4. Hi everyone. This is my first post here. I've read every thread that is even closely related to my problem on this site and other sites to be sure that I haven't missed something. I have a 91 Pathfinder that is in beautiful condition with 175,000 original miles on it that I recently purchased in august. This problem came on suddenly a few weeks ago. Truck starts strong with no problem when cold. I'll take it out and drive it and once it reaches running temp (about 10 minutes or so) it will start to sputter and lurch. I'm able to limp it home and park it. If I let it keep running it will eventually die. It will not start back up until it has cooled. Timing belt was changed about 30,000 miles ago. Other than that I don't have much information about the previous maintenance, though seeing its condition it would be hard to believe that it wasn't maintained regularly. I pulled the ECU codes and it is giving me #21 which relates to "Ignition Signal". From my research on this, I was led in the direction of Ignition Coil and Ignition Control Module. I replaced both with no positive result. Other threads that I've read mentioned various sensors (MAF, Coolant Temp, etc.). I think my best piece of information here is that everything runs great until it reaches temp. It feels to me like the engine may be flooding itself. Could this have something to do with the injectors not getting a signal that the vehicle has reached running temp and to adjust the fuel mixture? If so, would this signal be coming from the MAF or Coolant temp sensor? Please let me know if anyone has had this same problem or if you have any thoughts on the matter. Thanks!
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