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2008 Volvo VNL780 Jerking under heavy load no codes

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Cpervanic, May 16, 2016.

Page 1 of 3
  1. May 16, 2016 #1
    Cpervanic

    Cpervanic Bobtail Member

    9
    1
    May 16, 2016
    Georgia
    0
    Hey guys! My husband truck is jerking intermittently under a heavy load. The jerking increases while going uphill. Gas consumption goes down and only way to fix is to floor the gas pedal. It isn't throwing any codes. It's a 2008 Volvo vnl780 d13. Any ideas?
     
    Cpervanic, May 16, 2016
    Cpervanic, May 16, 2016
    #1
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  3. May 16, 2016 #2
    TROOPER to TRUCKER

    TROOPER to TRUCKER Anything Is Possible

    7,679
    12,751
    Dec 15, 2014
    Charlotte, NC
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    May be the clutch over heating
     
    TROOPER to TRUCKER, May 16, 2016
    TROOPER to TRUCKER, May 16, 2016
    #2
    Cpervanic Thanks this.
  4. May 16, 2016 #3
    ibcalm19

    ibcalm19 Road Train Member

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    2,435
    Nov 30, 2015
    Pennsylvania
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    How much play is in the clutch pedal?
     
    ibcalm19, May 16, 2016
    ibcalm19, May 16, 2016
    #3
    Cpervanic Thanks this.
  5. May 16, 2016 #4
    Socal Xpress

    Socal Xpress Road Train Member

    1,855
    1,958
    Dec 6, 2014
    Los Angeles, Ca
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    Injector cups!!!

    Have the copper cups been replaced? Do the rpms flutter when this happens? Is the truck hard to start?
     
    Socal Xpress, May 16, 2016
    Socal Xpress, May 16, 2016
    #4
    dustinbrock and Cpervanic Thank this.
  7. May 16, 2016 #5
    CruisingAlong

    CruisingAlong Medium Load Member

    374
    441
    Oct 17, 2014
    Tampa , FL
    0
    On the batteries are some wireconnectors that send power to ecm. I think there were 3 on my 2006 780. Replacing the connectors fixed a similar problem on mine. (It was dropping injectors)
     
    CruisingAlong, May 16, 2016
    CruisingAlong, May 16, 2016
    #5
    Cpervanic Thanks this.
  8. May 16, 2016 #6
    Socal Xpress

    Socal Xpress Road Train Member

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    Dec 6, 2014
    Los Angeles, Ca
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    If runs fine on flat ground and begins to have issues on hard pulls or slight grade then I would say injector cups.

    I had my done 3 times already and only 1 time it threw a code that was related to air in the fuel.
     
    Socal Xpress, May 16, 2016
    Socal Xpress, May 16, 2016
    #6
    BoostedTeg and Cpervanic Thank this.
  9. May 16, 2016 #7
    Cpervanic

    Cpervanic Bobtail Member

    9
    1
    May 16, 2016
    Georgia
    0
    It's not happening when he is shifting so he doesn't think it's the clutch. While the truck is idle the rpms flutter at times. While driving He can hear the motor jerking. Only had the truck about 4 months unsure if copper cups. Leaning toward injector cups from what we've read and what it is doing. Does it give a code when those go bad?

    Thanks for your help guys!!
     
    Cpervanic, May 16, 2016
    Cpervanic, May 16, 2016
    #7
  10. May 16, 2016 #8
    Cpervanic

    Cpervanic Bobtail Member

    9
    1
    May 16, 2016
    Georgia
    0
    When we first got the truck it was doing it pretty often, even on flat. We ran some injector cleaner through it and it was fine. When we get a load 15000+ it would start jerking but not constantly.
     
    Cpervanic, May 16, 2016
    Cpervanic, May 16, 2016
    #8
  11. May 16, 2016 #9
    Socal Xpress

    Socal Xpress Road Train Member

    1,855
    1,958
    Dec 6, 2014
    Los Angeles, Ca
    0
    Sometimes but then most times no codes. Take it to a shop and have them diagnose the issue.
     
    Last edited: May 16, 2016
    Socal Xpress, May 16, 2016
    Socal Xpress, May 16, 2016
    #9
  12. May 16, 2016 #10
    nikmirbre

    nikmirbre Road Train Member

    5,534
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    Jul 27, 2011
    High Point NC
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    If I type what im thinking, ill be banned......
     
    nikmirbre, May 16, 2016
    nikmirbre, May 16, 2016
    #10
    Oxbow, magoo68 and mp4694330 Thank this.
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