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Cummins N14 sudden power loss

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by whet1961, Oct 27, 2018.

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  1. Oct 27, 2018 #1
    whet1961

    whet1961 Bobtail Member

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    Jul 19, 2016
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    I've had this truck for a year with virtually no problems. Runs great and dependable. Lost power intermittantly the other day while on the interstate. Pulled over to look under the hood but of course could not see anything obvious. Got back on road and WARN ENG light comes and ENG SHUT DOWN light comes on though motor didn't shut down. Pulled over and sat there idling. Slight miss while idling. It acted like an injector had gone bad. Called roadside assist to hook to computer. Couldn't read codes because port not talking to computer. I'll have to figure that one out myself. Told me to drive it like that and would'nt hurt anything. I was empty and heading home anyway [ about 4 hrs away]. On the way home it was still missing and I couldn't get RPM's to go over 1500 even while going up through the gears. I've had an injector go out before but had no WARN ENG light and don't remember the 1500 RPM limit then either. Any ideas would be appreciated.
     
    whet1961, Oct 27, 2018
    whet1961, Oct 27, 2018
    #1
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  3. Oct 28, 2018 #2
    pup

    pup Light Load Member

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    Dec 3, 2011
    n.h.
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    An injector wiring fault will cause a check engine light, misfire & limit the rpm's to 1500. It could be a failed injector solenoid or broken pass thru connector. On a cold start, try to identify the misfire by feeling the exhaust manifold for a cold cylinder. If the check engine light is always on you should be able to get the codes from a diagnostic switch in or under the dash.
     
    pup, Oct 28, 2018
    pup, Oct 28, 2018
    #2
    tommymonza Thanks this.
  4. Oct 28, 2018 #3
    HopeOverMope

    HopeOverMope Road Train Member

    1,801
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    Feb 25, 2016
    I-20 LOUISIANA
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    Yeah, on the injectors you can also isolate cylinders by unplugging each injector one by one. Unplug one while the truck is running, if it starts looping and acting up, then plug it back up. That cylinder should be fine. But if u come across one, that when you unplug it and it makes no difference in the way it idles; u could have found the cylinder/injector at hand.
     
    HopeOverMope, Oct 28, 2018
    HopeOverMope, Oct 28, 2018
    #3
    LawDra55 Thanks this.
  5. Oct 29, 2018 #4
    whet1961

    whet1961 Bobtail Member

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    Jul 19, 2016
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    Thanks for your thoughts on this. I have found a bad injector by using that very method in the past. I will check the injector wires and see what I can find. Thanks again!
     
    whet1961, Oct 29, 2018
    whet1961, Oct 29, 2018
    #4
  7. Nov 21, 2018 #5
    whet1961

    whet1961 Bobtail Member

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    Jul 19, 2016
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    Well I fixed this a couple weeks ago and am just getting around to update in case someone has a similar problem sometime. Pulled code 323 from computer which is cyl 5 misfire. Turned out pass thru connector was bad. Took about one minute to find it once I got in there. Running fine once again. Thanks for the response!
     
    whet1961, Nov 21, 2018
    whet1961, Nov 21, 2018
    #5
    xsetra and stuckinthemud Thank this.
  8. Feb 8, 2019 #6
    Dan 379

    Dan 379 Bobtail Member

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    Feb 8, 2019
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    Hello guys , o have similar problem ,everytime i hit a road bump i seem to loose engone power, no active codes just mid 127 not responding,checked and cleaned all connections in battery area and starter still does it
     
    Dan 379, Feb 8, 2019
    Dan 379, Feb 8, 2019
    #6
  9. Sep 23, 2020 #7
    Crimedogg82

    Crimedogg82 Bobtail Member

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    Sep 23, 2020
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    Hey fellas I have a problem too my n14 does great till lately she has been weak on hills small one an pulling of like she sputtering but it’s not her speed is fine but her power drops toooooo fast a little hills I think it maybe the manifold but I have no leaks at all on my engine. I sound a lil rough when taking off an riding an loose power but keeps speed
     
    Crimedogg82, Sep 23, 2020
    Crimedogg82, Sep 23, 2020
    #7
  10. Dec 27, 2020 #8
    Crimedogg82

    Crimedogg82 Bobtail Member

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    Sep 23, 2020
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    Crimedogg82, Dec 27, 2020
    Crimedogg82, Dec 27, 2020
    #8
  11. Dec 25, 2021 #10
    Stsara2019

    Stsara2019 Bobtail Member

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    Dec 25, 2021
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    Stsara2019, Dec 25, 2021
    Stsara2019, Dec 25, 2021
    #10
  12. Jan 16, 2025 #10
    Alexrenfro

    Alexrenfro Bobtail Member

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    Jan 7, 2025
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    In need of help… I have a 2001 Volvo 670 with a red top n14 in it last Friday I made a turn and the truck just died lost all power and shut off thought that it was out of fuel put 9 inches in each side and replaced the shut off solenoid still nothing replaced the pump and still nothing I’m not getting any fuel out the pump at all any help is greatly appreciated
     
    Alexrenfro, Jan 16, 2025
    Alexrenfro, Jan 16, 2025
    #10
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