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Thread: 258 I6 wont crank

  1. #1
    War Eagle Me+3's Avatar
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    Default 258 I6 wont crank

    This weekend my Jeep died on the trail. At first i thought the jeep had flooded. I was on even ground, but i thought perhaps i was running to rich. Usually i can just fire it back up pat the peddel a few time and go on my way. The Jeep will turn over, and fire off only once. This usually happens if the peddel is floored. It will not fire off more than once and then goes back to just turning over. I have check all wire conections that i can think of, and i have ensured that the carb is getting fuel.

    I have an 85 CJ7 with a painlees wiring harness, DUI distributor, and an EMPI carb.
    When the jeep does fire off it is obviously getting fuel because the exsaust smells really rich. HELP
    85 CJ7 4.0 head Mopar MPFI 4.5'' suspension 1'' body lift 35 BFG 4:56 and Detriot lockers F&R 1 peice rear axel

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    Senior Member HillBillE's Avatar
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    Pull the ditributor cap, and have someone crank the motor. Make sure the rotor is turning a full 360* as the motor cranks.

    It could be the timing chain, or the roll pin on the gear on the distributor shaft.

    My CJ sheared the roll pin last April. It sucked.


    As long as the people remain armed,
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    War Eagle Me+3's Avatar
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    I checked the DUI and it does spin 360 degrees. I have also replaced the starter cylinoid and the inigtion module. I check for a spark last noght with the timing light and i'm not getting and spark, but i do have power to the DUI. I'll be calling them on monday to see about getting it replaced or repaired.

    After i get it running i think it's next stop will be EBAY.
    85 CJ7 4.0 head Mopar MPFI 4.5'' suspension 1'' body lift 35 BFG 4:56 and Detriot lockers F&R 1 peice rear axel

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    Newbie 84CJ7's Avatar
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    Have you checked the coil? I have run into that on mine a couple times.

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    Senior Member HillBillE's Avatar
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    Quote Originally Posted by 84CJ7 View Post
    Have you checked the coil? I have run into that on mine a couple times.
    X2 on the coil.

    Being as it's turning over, or 'Cranking', the starter soleniod won't change anything.

    What you have is a 'No Spark' situation.

    You need to check the coil for spark, if it's good, then check the rotor and distributor.

    Unfortunately, it's hard to diagnose from the keyboard. (especially when I suck at the electronics to begin with!)


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


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    MODERATOR warrior's Avatar
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    Also under the rotor there is a ignition module(GM) if that is bad you will not get any spark at the coil.
    If you don't give up---You will never fail.



    8th Combat Engineers (Sapper) (Vietnam 66)


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    War Eagle Me+3's Avatar
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    Quote Originally Posted by warrior View Post
    Also under the rotor there is a ignition module(GM) if that is bad you will not get any spark at the coil.
    I recieved that some advise from DUI when i called. So yesterday i took the DUI to Autozone to have the GM ignition module tested to determine if i needed to replace it. It passed the test. How do you check the coil for Spark on a DUI?
    85 CJ7 4.0 head Mopar MPFI 4.5'' suspension 1'' body lift 35 BFG 4:56 and Detriot lockers F&R 1 peice rear axel

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    MODERATOR warrior's Avatar
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    Quote Originally Posted by Me+3 View Post
    I recieved that some advise from DUI when i called. So yesterday i took the DUI to Autozone to have the GM ignition module tested to determine if i needed to replace it. It passed the test. How do you check the coil for Spark on a DUI?
    A question for you? does your rotor cap have the coil bolted on top?( I believe it does)
    One more posibilitie for no spark, is a grounded rotor.Look at the rotor where the shaft fit, and look for
    burn marks, GM is famous for that. When the coils fire to the rotor, the rotor send the fire to the shaft
    instead. So the plugs don't get any juice.
    Now if the "Module" is good and the "Rotor" is good,Make sure you have power to the module.
    If you have power to the module, Disconect one spark plug wire, Insert a small screw driver in the wire end
    hold it about 1/4 inch from ground and have some one crank the engine one full revolution.
    You should see a spark in there, Providing everything check ok.
    Good Luck

    PS I like your avatar.
    I'm a certified open water diver.
    also Specialty Diver.
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    Underwater Navigation
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    If you don't give up---You will never fail.



    8th Combat Engineers (Sapper) (Vietnam 66)


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    War Eagle Me+3's Avatar
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    I did checked with a screw driver to see if there was a spark and it failed the test. So on to the coil i guess. The coil is on top of the DUI, and i'm hoping Autozone or NAPA willl have a replacement. If not i'll send it to DUI and have them replace it for me. I have iliminated every other thing i can think of, so cross your fingers that it's the coil.
    85 CJ7 4.0 head Mopar MPFI 4.5'' suspension 1'' body lift 35 BFG 4:56 and Detriot lockers F&R 1 peice rear axel

  10. #10
    Senior Member HillBillE's Avatar
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    I don't have a DUI brand, but an HEI dizzy in my CJ. (cheap knock off from 4WDH-don't waste your $$$)

    While my coil was good, the contact where the wire plugged in was bad. Even with the wire connected correctly, it would only work sometimes.

    I finally replaced it with an OEM GM coil and WHAM! no more problems.

    I believe an OEM GM coil will fit in the DUI cap.

    You might want to try wiggling the power wire where it connects to the cap, while someone is cranking it over.

    I know this drove me nuts trying to figure it out.


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


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