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Will not run

Discussion in 'Wrangler TJ (1996-2006)' started by gowenby2002, Aug 12, 2018.

  1. Aug 12, 2018 at 7:36 PM
    #1
    gowenby2002

    #1
    gowenby2002 [OP] Member

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    stock late model wheels/street tires with adapters, 7 in. stock type fender flares, 4 core rad/elec.fan, all LED lights, spray-in bed liner in cab, front home-made tow brackets for flat-tow
    2002 4.0 TJ have replaced coil bar with 3 different ones, poured gas down intake, has new distributer. Ran fine when parked it, went to start it next day, just turns over very well, no fire at all. No bad fuses, checked them all. Could it be a bad computer located on firewall???
     
    gowenby2002, Aug 12, 2018
    #1
  2. Aug 12, 2018 at 7:49 PM
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    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Have you checked the crank position sensor?
    Is the fuel pump working?
     
    Prerunner1982, Aug 12, 2018
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  3. Aug 13, 2018 at 7:48 AM
    #3
    Awrench

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    Awrench Well-Known Member

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    computer is WAY WAY down list.

    Why did you replace coil?

    What codes are stored in PCM?

    KOEO (Key On Engine Off)
    is there 12v at injectors?
    is there 12v at coil?
     
    Awrench, Aug 13, 2018
    #3
  4. Aug 14, 2018 at 12:26 PM
    #4
    Squatchy

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    Squatchy Well-Known Member

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    I would say check the fuel pump first. Turn the key on and listen for the fuel pump. You can usually hear it running for a few seconds when you first turn the key on.
     
    Squatchy, Aug 14, 2018
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  5. Aug 14, 2018 at 2:21 PM
    #5
    Southeast Overland

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    Southeast Overland Well-Known Member

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    If you have poured gas down the intake and it does nothing you probably do not have spark. Which would lead me to believe it is a faulty CPS, and as a note just because you put a new one on does not mean that it is good. I have gotten a few non-functioning CPS's right out of the box recently.

    ~Jeff
     
    Southeast Overland, Aug 14, 2018
    #5
    Squatchy likes this.
  6. Aug 17, 2018 at 11:41 AM
    #6
    Awrench

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    Awrench Well-Known Member

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    hearing the fuel pump run is 1 test - check pressure with a gauge is still needed.

    AGREED new ≠ good
     
    Awrench, Aug 17, 2018
    #6
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