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2nd gen issues? Try this first!

Discussion in 'Stock 1995 - 2001 Explorers' started by Turdle, July 17, 2017.

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    1. Turdle

      Turdle I bake stuff Staff Member Moderator Elite Explorer

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      2000 Mounty
      Sometimes a gremlin can be caused by the smallest thing.

      There are 2 large wire bundle connectors on the firewall. Both are held tight with a 10mm bolt.
      Any bad connection in either plug can cause just about any issue. from bad transmission shifting, bad o2 sensor readings, no start, no power, etc.

      Right above the HVAC blower motor is the PCM connector.
      001.JPG
      Above the intake manifold is a large square black connector. This is the main harness for everything electrical and transmission related from truck to main wire harness. Trans harness for short. It also has the 02 sensor wiring because they run down along the transmission.
      002.JPG

      since this cost nothing, and can cause a lot of issues, the first thing in your troubleshooting should be to loosen these connectors, look them over for bent or pushed back pins, and then if all looks good, re-seat them and tighten the bolt.

      If this does not help you, well, keep digging in the forum for an answer.
      If it does, please post in this thread so we can keep track.

      Thanks, and good luck!
       
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    3. MAS Tequila

      MAS Tequila Elite Explorer

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      The Trans connector was the cause of my alternator issues.

      And very likely the cause of the all the codes, O2 sensors, I was getting.

      So 2 O2 sensors, 2 coil packs, 1 alternator, about 30 hours, and a lot of swearing could probably have been avoided.

      I found mine was loose while tracing back the green/red wire.

      After separating the connector, I sprayed both pieces with MAF cleaner, it was sitting right there, let it dry then put it together and snugged the bolt up.

      The alternator issue went away immediately, and all residual rough running smoothed right out.

      Live and learn, remember Occam's Razor!
       
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    4. Brownpsu78

      Brownpsu78 Active Member

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      City, State:
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      Year, Model & Trim Level:
      2001 XLT
      What was your alternator issue?
      What codes was thebo2 sensor throwing?
       
    5. inkjunkie

      inkjunkie Member

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      Could one of these connectors cause a b1352 code?
       
    6. Collin Whitfield

      Collin Whitfield New Member

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      City, State:
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      Year, Model & Trim Level:
      1999 Ford Explorer EB
      I was getting codes for unresponsive O2 sensors and a misaligned camshaft.

      Spent about $300 in repairs and check engine light was still on and couldn't pass emissions.

      I was super confused after I replaced the O2 sensors because my OBDII reader was showing no change in the O2 sensor voltage when I revved the engine, even though the others changed.

      Just unplugged both connectors and blew out with canned air and all is well now!

      Thanks for the help!
       
    7. tiberius

      tiberius New Member

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      96 explorer sport
      hey folks ..have a 96 explorer sport ..im getting a morse code type beeping that wont stop..starts right away after start up ..its not the 5 beep from a burned out airbag light ..ive had that ..this is like morse code ..very annoying..scanner shows no codes related to this..seems to come from gem module in dash..what is causing this? ive sprayed all the door locks ..wiggled the ignition tumbler..no check engine light ..but will show the slow 02 sensor code for both banks.
       
    8. tiberius

      tiberius New Member

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      after pulling my gem module i opened it up and found a blown out capacitor on the board ..must have quite literally Blown as it left a burn on both sides of the board and the positive side leg of that component is Gone...i do occasionally solder repair some of my cb radio gear but i will call my Tech guy to look at this ..too small a scale for me to feel comfortable with..hoping it didnt ruin the board when it blew..everything but my dome lights worked and if it didnt do the morse code beep i would have left it alone..i guess i could have him remove the buzzer from the board but i would lose all the warning chimes..sure hope he can fix it as i dont relish the idea of tracking down another one..they arent cheap ..a real cat in a bag situation..oh well ..wish me luck
       
    9. rlb245

      rlb245 New Member

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      Year, Model & Trim Level:
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      This Might be a good place for me to start looking. I new I came to the right place
       
    10. slsnut

      slsnut Member

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      Glad I tried this first! Have had a temp gauge wild fluctuation for 2 years now that started out of the blue on a long drive back from out of state. Changed the senders and thermostat twice, water pump and radiator once and before I dug into the cluster to fix the gauge, I tried spraying these connections with MAF cleaner and drying them with compressed air. Gauge is solid now, my left front speaker now works and engine seems to idle smoother. Have a 1995 Explorer Eddie Bauer with 80K orig miles. Thanks for the tip here!:chug::whitenavajo::usa:
       
    11. corignelson

      corignelson New Member

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      1999 Explorer XLT
      MAF cleaner seems to work pretty well, but there might be a cheaper alternative. Its called contact cleaner or electronics cleaner, depending on store purchased from, and it is safe on paints/plastics. Here in Sacramento its about 70% the cost on average. Another good habit to get into is applying dielectric grease to the terminals before reconnecting. It keeps moisture out and corrosion to a minimum.
       
    12. Explorer2.0

      Explorer2.0 Our low milage and well cared for 2nd Gen TARDIS! Elite Explorer

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      THANK YOU!!! We just did this to both connectors yesterday thanks to this post. FINALLY cured the temperamental coolant gauge. Blasted air, then cleaner, then more air, then DeoxIt Gold. Did the trick! THANKS AGAIN!

      Team TARDIS

      20180418_102601.jpg
       
    13. slsnut

      slsnut Member

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      Was your temp gauge occasionally moving from the normal position to just below the top of the scale then returns to normal quickly? This is what mine was doing and the condition returned shortly after I did the cleaning. It may have been unrelated but for the record the front left speaker still works well.
       

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