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CJ5 won't crank after new control module installed

Discussion in 'Jeep CJ' started by 75cj5, Aug 31, 2017.

  1. Aug 31, 2017 at 11:10 AM
    #1
    75cj5

    75cj5 [OP] Member

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    My ignition control module is getting so hot that it's melting. The jeep still cranks and runs, but I ordered a new module anyways. When I installed the new part I could not get the jeep to crank. Could this just be a grounding problem or what? Oh I have a 1975 cj5.
     
  2. Aug 31, 2017 at 7:22 PM
    #2
    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.
    Best thing I ever did was junk the Ford ICM, coil, and distributor that AMC used in the cj, and replaced it with a HEI distributor. This is what I suggest you do, but if you want to keep your set up we need more information. What to you mean by won't crank? Will it turn over, but not start, Or when you turn the key nothing happens?
     
    JKBob 25 likes this.
  3. Aug 31, 2017 at 7:36 PM
    #3
    JKBob 25

    JKBob 25 Well-Known Member

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    I'm subbed. I have no idea what your issue might be.
    But I constantly learn from OFFGRID. Another learning thread for sure. :)
     
  4. Sep 5, 2017 at 9:33 AM
    #4
    75cj5

    75cj5 [OP] Member

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    I will check into that setup but money and time wise I'll have to stick with this for right now but yes it will turn over just not start.
     
  5. Sep 13, 2017 at 6:27 PM
    #5
    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.
    Turning over and not starting is spark, or fuel. Probably not the CM, but a coil or the electronics of the distributor if it is a spark issue. If not it is likely the fuel pump.
     
    JKBob 25 likes this.
  6. Sep 14, 2017 at 3:43 PM
    #6
    75cj5

    75cj5 [OP] Member

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    That's what I was thinking but it cranks with the old cm just not the new one is what has me confused
     
  7. Sep 14, 2017 at 4:10 PM
    #7
    OFFGRID

    OFFGRID Well-Known Member

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    Peter
    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.
    Have you put the old one back in to see if it will start. Where is it melting? The under side? Mine did the same thing. They all get hot. That gel just gets old and sort of comes apart. I think I paid less than $100 for my HEI on eBay. Fixed all my ignition problems.
     
    JKBob 25 likes this.
  8. Sep 14, 2017 at 4:13 PM
    #8
    75cj5

    75cj5 [OP] Member

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    Yeah it's the underside the black gel that's melting and I put the old one back in and it started right up
     
    JKBob 25 likes this.
  9. Sep 14, 2017 at 5:28 PM
    #9
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
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    First Name:
    Peter
    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.
    Sounds like The new one is a faulty CM.
     
    JKBob 25 likes this.
  10. Sep 15, 2017 at 11:51 AM
    #10
    75cj5

    75cj5 [OP] Member

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    Alright thanks and ill check on the HEI
     
    JKBob 25 likes this.
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