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Spn 1325 FMI 31

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cld logistics llc, Jun 14, 2025 at 9:43 AM.

  1. Jun 14, 2025 at 9:43 AM #1
    cld logistics llc

    cld logistics llc Bobtail Member

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    Hello, I need help. I have a DD15 that gave me an SPN code of 1324 FMI 31, cylinder 2. I changed the harness, QCV, rail pressure sensor, and calibrated the valves. Now I'm changing to cylinder 3. The rail pressure is good, and the cutout is failing. Cylinder 3 has no smoke or fluid loss. Thank you.
     

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    cld logistics llc, Jun 14, 2025 at 9:43 AM
    cld logistics llc, Jun 14, 2025 at 9:43 AM
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  3. Jun 14, 2025 at 10:10 AM #2
    JB7

    JB7 Heavy Load Member

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    Section 86.1 SPN 1324/FMI 31 - DETROIT MBE-900 DDEC VI Troubleshooting Manual
    Miles? Need to run a relative compression test. Look at the cam lobes, adjust the valves. If that test fails then you found the problem. If it passes then only the injector is left as you don't have any leaks.
     
    Last edited: Jun 14, 2025 at 10:24 AM
    JB7, Jun 14, 2025 at 10:10 AM
    JB7, Jun 14, 2025 at 10:10 AM
    #2
    062 Thanks this.
  4. Jun 14, 2025 at 6:09 PM #3
    062

    062 Road Train Member

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    When you have a new problem after a repair go back and check your previous work.
    Start just like you have never seen the truck before.
     
    062, Jun 14, 2025 at 6:09 PM
    062, Jun 14, 2025 at 6:09 PM
    #3
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