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N14 celect

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jdw900, Apr 2, 2021.

Page 1 of 2
  1. Apr 2, 2021 #1
    Jdw900

    Jdw900 Bobtail Member

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    Jan 19, 2021
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    Hope you guys can help me I have a 1992 kw W900 n14 problem is that is not boosting over 15 psi and during idle It will jump from 800 rpms to 900 but it does not do it all the time also if the I turn the truck off and on it will start boosting just fine until I get to the highest gear then it drops back to 15psi no more sometimes even lower
     
    Jdw900, Apr 2, 2021
    Jdw900, Apr 2, 2021
    #1
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  3. Apr 3, 2021 #2
    Big Orange

    Big Orange Bobtail Member

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    Oct 2, 2018
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    If it were me I’d change fuel filters and check/ blow out the air filters first. Always start simple. Next, I’d get the ecm scanned for electrical faults. If no faults show up I would replace the fuel lines. It really sounds like a fuel feed line is collapsing and starving it for fuel once in awhile. Also- make sure the vents on the fuel tanks work. If all that checks out then you’re into the world of checking grounds and looking for chafed wiring on the engine harness- good luck!
     
    Big Orange, Apr 3, 2021
    Big Orange, Apr 3, 2021
    #2
  4. Apr 3, 2021 #3
    Jdw900

    Jdw900 Bobtail Member

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    Jan 19, 2021
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    Check tps for volts and at the time that I was having issues it read 3v even with throttle fully open so I change the tps today and it still did the same thing I already change fuel filter and check lines for holes and nothing so I am guessing is going to be electrical any other advice? Thanks for the help
     
    Jdw900, Apr 3, 2021
    Jdw900, Apr 3, 2021
    #3
  5. Apr 3, 2021 #4
    062

    062 Road Train Member

    6,215
    33,462
    Oct 20, 2013
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    Have you load tested the power wire for the ecm?
    Confirm voltage to fuel shut off solenoid.
     
    062, Apr 3, 2021
    062, Apr 3, 2021
    #4
  7. Apr 3, 2021 #5
    Final Drive

    Final Drive Road Train Member

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    Jan 21, 2015
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    20210403_212610.jpg
    Don't forget this little guy..
     
    Final Drive, Apr 3, 2021
    Final Drive, Apr 3, 2021
    #5
    mile marker 27, jamespmack, tommymonza and 1 other person Thank this.
  8. Apr 3, 2021 #6
    Jaebo74

    Jaebo74 Medium Load Member

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    Feb 4, 2021
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    Just for future knowledge, is that in the pump?
     
    Jaebo74, Apr 3, 2021
    Jaebo74, Apr 3, 2021
    #6
  9. Apr 3, 2021 #7
    Final Drive

    Final Drive Road Train Member

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    Jan 21, 2015
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    Yes Sir, right next to the port were you check on pump output..
     
    Final Drive, Apr 3, 2021
    Final Drive, Apr 3, 2021
    #7
    jamespmack and Jaebo74 Thank this.
  10. Apr 3, 2021 #8
    kwcam

    kwcam Light Load Member

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    Dec 29, 2012
    at the shop
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    Also there is a check valve in the fuel fitting that is in the ecm cooling plate that tends to get restricted with debris. the fitting is on the outlet side of the cooler plate, remove the fuel line and the fitting and blow it out.
     
    kwcam, Apr 3, 2021
    kwcam, Apr 3, 2021
    #8
    mile marker 27 and jamespmack Thank this.
  11. Apr 3, 2021 #9
    Jaebo74

    Jaebo74 Medium Load Member

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    Thanks
     
    Jaebo74, Apr 3, 2021
    Jaebo74, Apr 3, 2021
    #9
    Final Drive Thanks this.
  12. Apr 4, 2021 #10
    Jdw900

    Jdw900 Bobtail Member

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    Jan 19, 2021
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    I will check the shutoff solenoid next . I already check that little filter and is good I also check that check valve on the cooling plate and it was good l. I am thinking that if I am reciving only 3v to the sensor than it should be a problem between the ecm. Is there anything else that could fail and make the sensor get 3v ?
     
    Jdw900, Apr 4, 2021
    Jdw900, Apr 4, 2021
    #10
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