Detroit 60 crank no start

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Lesjohnson1212, Nov 28, 2023.

  1. Lesjohnson1212

    Lesjohnson1212 Bobtail Member

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    Feb 23, 2021
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    Hi first post need so help, got a 1997 Peterbilt 379 Detroit 60 12.7 that will crank but won't start.
    to start my truck was running then one day it wouldn't start any more, I've changed the TRS and SRS sensors 4 months ago got 4 new batteries new positive cables starter to battery box, new ECM(battery was busted) new fuel pump, new valve being the head of the engine, checked all fuses and even change the alternator before it stoped running, new fuel filters, cleaned all cables ends and grounds. when I turn the key volts show a 12.5 tried a jump starter got it to 13.3 still no start. when I try and start it volts go below 10volts idk what I'm doing wrong feels like I'm chasing my tail on this one.
     
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  3. Magoo1968

    Magoo1968 Road Train Member

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    Some have a little fuse on the wires near the battery for the ecm .
     
  4. uncleal13

    uncleal13 Road Train Member

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    There’s a check valve on the back of the head that feeds the fuel return line. If the check valve is shot you won’t be able to get enough fuel pressure that the ecm has to sense before it will fire the injectors.
    Also i had one that lost its fuel prime due to air getting into a fitting of one of the suction lines to the tanks.
    A fuel pressure gauge would help in both these instances.
     
  5. pakob85

    pakob85 Bobtail Member

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    Nov 29, 2023
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    but is that possible after been workin Perfect, just next day don’t start. ?
    I’m asking because I have the same problem right now
     
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  6. blairandgretchen

    blairandgretchen Road Train Member

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    The TRS and SRS - if one is faulty it prevents start, if the other is faulty it prevents run.

    What was the original reason you changed them 4 months ago?

    I had the same issue a couple of years back - ether started it, I didn't shut it off till home, replaced TRS/SRS and never happened again.

    Ditto the above advice on verifying fuel flow too.
     
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  7. Lesjohnson1212

    Lesjohnson1212 Bobtail Member

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    Feb 23, 2021
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    yea I changed that it was hard to get too btw lol.
     
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  8. Lesjohnson1212

    Lesjohnson1212 Bobtail Member

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    yea idk I'm think it was a because of the eco battery so when I got a new I found out the little battery inside it as bad but that didn't solve my problem.
     
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  9. Lesjohnson1212

    Lesjohnson1212 Bobtail Member

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    Feb 23, 2021
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    4 months a go it didn't wanna start similar to now so I replaced them both and it started right up didn't do that this time because I don't wanna believe the sensors went out in less than 4 months.
     
  10. Smellfunny

    Smellfunny Road Train Member

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    Pull the timing sensor out behind the air compressor and see if there is any metal on the probe end. If so then you have something going out on the front. Does the check engine lights come on when you switch the ignition on? If not then there is no power to the ECM. Check the fuses and the wires in battery box to make sure they are not losing power. I usually take a headlight and run wires from it to the power connector that hooks into the ECM to check the grounds and positives on the power plug. If you have ECM power and the timing sensors are ok then I would look at fuel pressure issues.
     
  11. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Right on the money!!!
     
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