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What's wrong with my 379

Discussion in 'Trucks [ Eighteen Wheelers ]' started by machineman4223, Sep 1, 2013.

Page 1 of 2
  1. Sep 1, 2013 #1
    machineman4223

    machineman4223 Light Load Member

    92
    20
    Dec 15, 2012
    Nashville TN
    0
    Well yesterday on my way home had the cruise set and all of the sudden the truck loss power. It dropped from 1350 rpms to about 1100 then the power came back. The further I drove the more frequent it did it. Then I stopped for a 30minute break and the lower gears it acted just fine then I hit 5 low and nothing for like 10 sec and then the power came back. And when I say power I mean the engine didn't shutoff at least I don't think so. It just wouldn't react to the fuel pedal at all and then it would. Any ideas out there
     
    machineman4223, Sep 1, 2013
    machineman4223, Sep 1, 2013
    #1
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  3. Sep 1, 2013 #2
    maxicruise

    maxicruise Light Load Member

    58
    19
    Aug 11, 2010
    Illinois
    0
    Crank or cam sensor? Possible bad connection for ECM power?
     
    maxicruise, Sep 1, 2013
    maxicruise, Sep 1, 2013
    #2
  4. Sep 1, 2013 #3
    machineman4223

    machineman4223 Light Load Member

    92
    20
    Dec 15, 2012
    Nashville TN
    0
    I was kinda of thinking it was some sort of connection.
     
    machineman4223, Sep 1, 2013
    machineman4223, Sep 1, 2013
    #3
  5. Sep 1, 2013 #4
    morehp

    morehp Medium Load Member

    699
    206
    Jun 18, 2012
    0

    What engine ? Can you get codes out with cruise switches ?
     
    morehp, Sep 1, 2013
    morehp, Sep 1, 2013
    #4
  7. Sep 1, 2013 #5
    machineman4223

    machineman4223 Light Load Member

    92
    20
    Dec 15, 2012
    Nashville TN
    0
    It's a c-15. It says no active codes
     
    machineman4223, Sep 1, 2013
    machineman4223, Sep 1, 2013
    #5
  8. Sep 1, 2013 #6
    morehp

    morehp Medium Load Member

    699
    206
    Jun 18, 2012
    0
    Check the wiring to the crank sensor from the ECM. Possibly crank or cam sensor playing up also, they have been known to do that without codes.
     
    morehp, Sep 1, 2013
    morehp, Sep 1, 2013
    #6
  9. Sep 1, 2013 #7
    GrapeApe

    GrapeApe Road Train Member

    2,215
    2,211
    Jan 7, 2013
    0
    Did you try fuel filters? You could have gotten a bit of crappy fuel in the tanks. Drain some out of the primary and see if you have nay water.
     
    GrapeApe, Sep 1, 2013
    GrapeApe, Sep 1, 2013
    #7
    olpa77 Thanks this.
  10. Sep 1, 2013 #8
    machineman4223

    machineman4223 Light Load Member

    92
    20
    Dec 15, 2012
    Nashville TN
    0
    Yah I did that. It really feels like a bad or short connection. Ive had bad fuel before it would spider every time you got on the fuel. This just happens when it's at 1350 rpms and drops to1100 and then its normal
     
    machineman4223, Sep 1, 2013
    machineman4223, Sep 1, 2013
    #8
  11. Sep 1, 2013 #9
    Fatone

    Fatone Bobtail Member

    15
    3
    Jul 11, 2013
    0
    You might want to replace the TPS on the accelerator pedal.
     
    Fatone, Sep 1, 2013
    Fatone, Sep 1, 2013
    #9
  12. Sep 1, 2013 #10
    GrapeApe

    GrapeApe Road Train Member

    2,215
    2,211
    Jan 7, 2013
    0
    I'd check the battery power & grounds to the ECM and the ignition switch power to the ECM first. That is the most likely electrical problem that will not log a code. TPS and timing sensors can be bad without a code, just less likely with it being a problem for several seconds.
     
    GrapeApe, Sep 1, 2013
    GrapeApe, Sep 1, 2013
    #10
    wore out Thanks this.
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