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low power....

Discussion in 'Ask An Owner Operator' started by omer, Dec 6, 2012.

Page 1 of 2
  1. Dec 6, 2012 #1
    omer

    omer Bobtail Member

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    Dec 6, 2012
    Atlanta GA
    0
    hello i am new to this so plz bear with me.
    i have a 2006 volvo 670 with volvo d12 engine 710xxx miles egr's and egr cooler disconnected, my boost pressure is 31psi@1900rpm and my fuel 68psi@1900rpm but the truck still lacks the power. the mec says to change all 6 injectors and see but to me thats a big gamble about $3500 and i am not so sure that would fix it. if any one has any ideas please let me know.
    thank you
     
    omer, Dec 6, 2012
    omer, Dec 6, 2012
    #1
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  3. Dec 6, 2012 #2
    VisionLogistics

    VisionLogistics Road Train Member

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    I'd start with a dyno to get tangible numbers on the performance before dropping $$$ on 6 injectors. Failing injectors will present other symptoms besides retarded performance.
     
    VisionLogistics, Dec 6, 2012
    VisionLogistics, Dec 6, 2012
    #2
    omer Thanks this.
  4. Dec 6, 2012 #3
    Tuzla075

    Tuzla075 Light Load Member

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    Dec 4, 2012
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    Is it ultrashift?
     
    Tuzla075, Dec 6, 2012
    Tuzla075, Dec 6, 2012
    #3
  5. Dec 7, 2012 #4
    omer

    omer Bobtail Member

    14
    3
    Dec 6, 2012
    Atlanta GA
    0
    no it's a 10 speed straight meritor transmission
     
    omer, Dec 7, 2012
    omer, Dec 7, 2012
    #4
  7. Dec 7, 2012 #5
    omer

    omer Bobtail Member

    14
    3
    Dec 6, 2012
    Atlanta GA
    0
    can you tell me what other symptoms i would have if the injectors were failing

    thank you
     
    omer, Dec 7, 2012
    omer, Dec 7, 2012
    #5
  8. Dec 7, 2012 #6
    VisionLogistics

    VisionLogistics Road Train Member

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    I'm not real familiar with the volvo engine but some common symptoms of injector failure are:

    - Unstable engine speed
    - Poor fuel economy
    - Runs rough / missing
    - Audible engine knock (fuel knock)
    - Air in the return fuel

    To name just a few. Have you done a cylinder performance test yet? If so what were the percentage numbers?
     
    VisionLogistics, Dec 7, 2012
    VisionLogistics, Dec 7, 2012
    #6
  9. Dec 7, 2012 #7
    nikmirbre

    nikmirbre Road Train Member

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    High Point NC
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    Poor fuel mileage.......And a dyno will tell you nothing, no good reason to get a dyno.....
     
    nikmirbre, Dec 7, 2012
    nikmirbre, Dec 7, 2012
    #7
  10. Dec 7, 2012 #8
    omer

    omer Bobtail Member

    14
    3
    Dec 6, 2012
    Atlanta GA
    0
    no i have not done a cylinder performance test yet
     
    omer, Dec 7, 2012
    omer, Dec 7, 2012
    #8
  11. Dec 7, 2012 #9
    omer

    omer Bobtail Member

    14
    3
    Dec 6, 2012
    Atlanta GA
    0
    and i am not sure if volvo dealer would do one with the egr's being disconnected
     
    omer, Dec 7, 2012
    omer, Dec 7, 2012
    #9
  12. Dec 7, 2012 #10
    TripleSix

    TripleSix God of Roads

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    Has it always been this way? If it has, I would wager that someone cut it back more than than 10 percent
     
    TripleSix, Dec 7, 2012
    TripleSix, Dec 7, 2012
    #10
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