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1990 jeep 4.0 problems (Help please)

Discussion in 'Cherokee' started by JeepLife0190, Jan 31, 2017.

  1. Jan 31, 2017 at 5:26 PM
    #1
    JeepLife0190

    JeepLife0190 [OP] New Member

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    Lifts, tires, wheels, etc
    Hi I have a 1990 Jeep cherokee with the inline 6 4.0. When i bought this jeep it didnt run whatso ever. I put a lot of time into it and got it running. Well it ran amazing but only for one day. Now it only cranks and idles when cold. When its up to temp it will not crank without a little starter fluid in the intake. It will idle at temp though. Also when i give it throttle it will choke itself out. It takes very little (barley enough to fit a piece of paper between the butterly valve in the intake.) ive replaced the following:
    Fuel pump, fuel filter, throttle position sensor, MAP sensor, MAT sensor, ignition coil, plug wires and plugs, and ive checked the pcm for corrosion but all looked well and it still has the problem. Nothing is different other than the new parts since it ran amazing. Does anyone have a clue?
     
  2. Feb 2, 2017 at 2:06 PM
    #2
    OleMissYJ

    OleMissYJ Active Member

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    Could be vacuume related or maybe even the distributor.
     
    OFFGRID likes this.
  3. Feb 4, 2017 at 6:41 PM
    #3
    C2T

    C2T Well-Known Member

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    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    Welcome to the forum
     
  4. Feb 5, 2017 at 10:18 AM
    #4
    booger3399

    booger3399 New Member

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    Have you tried replacing the crank position sensor. Had to replace on mine when it started cutting off then wouldn't start at all.
    I have an 87 Cherokee with 276k on it. It has been a good vehicle but can be a pain when things start going wrong. I found a lot of help from these forums, though. It has saved me a lot of money and aggravation having this kind of help. I commend all backyard mechanics for taking the time to help.
     
  5. Mar 12, 2017 at 5:42 PM
    #5
    Nickols33

    Nickols33 Member

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    92 xj 4.0 l6 stock pos
    rattle canned it primer grey(black rims) e3 spark plugs
    if it idles when cold and not when hot i would go the routin of your cooling sytem i had a really rough idle and rough starts i replaced evrything exept my raidiator which is on the list and it runs a millionm times better
     
  6. Mar 14, 2017 at 6:56 PM
    #6
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    I read in the dealer service manual that the Jeep will run in closed loop mode bypassing all sensors until it reaches operating temperature then it switches to open loop and the computer takes over reading all sensors. It could be any one of them causing this. The IAC, TPS, Temp, map, O2, etc.
     
  7. Mar 20, 2017 at 12:35 PM
    #7
    Davidbkills

    Davidbkills New Member

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    Dose anyone know why my 96 xj dash lights would go out iv changed all the bulbs and fuses
     
  8. Mar 20, 2017 at 12:39 PM
    #8
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.

    Possibly a bad ground to the dash? I'm not too familiar with XJ electronics.
     

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