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Cherokee Mix And Match Sensor Trouble

Discussion in 'Quitters' Club' started by fhoehle, Mar 9, 2018.

  1. Mar 9, 2018
    fhoehle

    fhoehle Sponsor Sponsor

    Eynon, PA
    Joined:
    Apr 11, 2012
    Messages:
    695
    I have a 2001 Cherokee plow truck. It has a 1996 engine installed, with hillbilly workarounds on having 2 O2 sensors instead of 4. It always ran well, but 12 -13mpg. Don't care as it didn't like a few of the O2 sensors, said there was something wrong. Unhooked sensor wire, ran well, been running for 2 years that way, no problems. Lately it hunts while driving and runs rich as hell at idle. If you jump on it, it'll run awesome but idling or cruising it is crazy rich. I replaced all the sensors when I got it, tps map iat iac coolant. I replaced them again under warranty chasing the rich condition. Could a bad computer do this? I am running out of options. Obviously a scan notices the unplugged O2 sensors and says yep that's it, but it was fine for 2 years like that. I don't care about the emissions or inspection, it's a plow truck. Just need to get through the season. Any thoughts?
     
  2. Mar 9, 2018
    sterlclan

    sterlclan Member Sponsor

    exploring the...
    Joined:
    Feb 21, 2009
    Messages:
    2,462
    could be a stuck injector.
     
  3. Mar 12, 2018
    Jrobz23

    Jrobz23 Member

    Northern, WI
    Joined:
    Oct 3, 2016
    Messages:
    302
    Square body Cherokee 4.0L AW4?

    Check fuel pressure and plugs.
     
  4. Mar 14, 2018
    fhoehle

    fhoehle Sponsor Sponsor

    Eynon, PA
    Joined:
    Apr 11, 2012
    Messages:
    695
    Ok, since I put a 1996 engine in my 2001 Cherokee a few years ago, it never ran right with all 4 o2 sensors plugged in. Ran great with only two plugged in. My son was greasing it a few weeks ago and saw some plugs disconnected. He plugged them back in and caused the problems to begin. I found them all plugged back in, unplugged the offenders, and poof, runs perfect again. I don’t know why it works this way but don’t care, it’s just a plow truck and winter rot box. It runs great again.
     
    ITLKSEZ likes this.
  5. Mar 14, 2018
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    2,159
    :bananatool:
     
    fhoehle likes this.

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