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12.7 Detroit

Discussion in 'Trucks' started by petepilot, Jan 22, 2020.

  1. petepilot

    petepilot Senior Member

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    94 yr mod 12.7 det. Died on the road this am as if ign. Turned . off will not start back not fuel problem . any thoughts?
     
  2. RZucker

    RZucker Senior Member

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    Look for ECM power fuses from the batteries first.
     
    Tenwheeler likes this.
  3. petepilot

    petepilot Senior Member

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    Power prob. Was my first thought. Have not checked it yet myself had it towed to yard
     
  4. funwithfuel

    funwithfuel Senior Member

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    Should be 2 fuses. 1 for each set of 3 cylinders. If you lost 1 it shoulda kept running on 3. If you dont have any error codes, pull the sir compressor discharge hose off. Crank the engine and see if you get delivery. If the accessory drive fails you lose compressor and fuel pump. Dragged a lot of Freightliner off the highways for this common problem
     
    63 caveman and Tenwheeler like this.
  5. LN Pipeline

    LN Pipeline Well-Known Member

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    My neighbor had this problem with a 12.7. Ended up being low coolant. Guess there is a shutoff switch for this?

    I don’t know if your problem is that simple, but you could check.
     
  6. crane operator

    crane operator Senior Member

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    Will it crank, but just not start, like its out of fuel but you have fuel? Mine had a rubbed through wire behind the air compressor. I think its the wire that ran from ecm to crank sensor on the front of the engine.
     
    funwithfuel likes this.
  7. petepilot

    petepilot Senior Member

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    I was able to bow out on this one .Turned it over to a shop that is supposed to have the talent & equip.to handle any Detroit prob.:) but yes it would crank but no go.
     
  8. petepilot

    petepilot Senior Member

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    accessory drive link took a dive
     
    funwithfuel likes this.