12.7 Detroit backfires and throws fireballs

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Flipp, Apr 11, 2020.

  1. Rideandrepair

    Rideandrepair Road Train Member

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    3026F081-E7E8-46C7-9227-7736D877C754.png The serial # is located on the block under the manifolds according to the previous chart. This explains the date and serial #s. Need to get the #, see if it’s after the date noted, May 1998. It should be if engines original to the Truck. The dates important because all blocks afterwards were pre drilled for oil squirters for wrist pin cooling. So whether you have them or their capped off, they can be added. Prior engines, only the PK was drilled.
     
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  3. wilco379

    wilco379 Bobtail Member

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    Im having the same issue with my 12.7 detroit I've done everything to the mood and back on it still have this problem. Is the problem your having constant? or intermittent?
     
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  4. DetroitDudeBro

    DetroitDudeBro Bobtail Member

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    Problem was intermittent. Depending on ambient temperature and baro pressure. Problem was 100% resolved with custom tuning.
     
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  5. wilco379

    wilco379 Bobtail Member

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    What did you end up doing as far as custom tunes, and did you have to change anything with ambient temp or baro pressure? or is that all done by tuning? @DetroitDudeBro
     
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  6. Rideandrepair

    Rideandrepair Road Train Member

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    Finally sounds like some insight to the problem. The only thing different after my inframe is the Turbo. I put a BG non wastegated on it. I wonder if that could be causing the whole issue. I also had the injector calibrations increased. Starting with the highest one at 75, and the other 5 increased the same amount. That may also be the problem with mine. I doubt it, though the Detroit manual says improper injector settings can cause it.
     
  7. goga

    goga Medium Load Member

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    :cool:. yap

    Also check exost, restricted, no (mufler off, on). There is backpressure somewhere.
     
    Last edited: Dec 13, 2021
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