Truck won't run over 20 mph

Discussion in 'Volvo Forum' started by E70x, Jun 17, 2020.

  1. E70x

    E70x Bobtail Member

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    Jul 26, 2014
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    2006 Volvo VNL 780 465hp 10 speed autoshift.
    Everything was good, after installing new injectors, cups and I rings and tune up , acceleration is so slow. On idle work fine. We checked EPG and replace it, checked exhaust pipe behind turbo and it's wide open. Checked it on other ECU, need fault codes. EGR valves are new and welded. Meanwhile AC blower stopped working and we replaced it. Qualcomm cable disconnected.
    After this when start engine acceleration pedal is not responding for 30-45 seconds.
    Truck can not run over 20-22 mph. No codes.
    Can it be problem with fuel system, lines, separator, filter....
    No codes
    PLEASE HELP ME
     
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  3. bad-luck

    bad-luck Road Train Member

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    Could be clogged fuel filters, they are cheap. Emissions related issues, will restrict power.
     
  4. E70x

    E70x Bobtail Member

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    Jul 26, 2014
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    Changed with oil and oil filters
     
  5. bad-luck

    bad-luck Road Train Member

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    Try getting a lazer temperature gun. Around $10 at harbor freight. Check each cylinder at the exhaust manifold to see if they are all firing. Temps should allbe around the same
     
  6. E70x

    E70x Bobtail Member

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    If they not firing all, you think injectors are bad or?
     
  7. bad-luck

    bad-luck Road Train Member

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    Could be, could be a wire/plug
     
  8. bad-luck

    bad-luck Road Train Member

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    Could be, could be a wire/plug. It's hard to diagnose a problem on a forum
     
  9. E70x

    E70x Bobtail Member

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    Jul 26, 2014
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    I know but I don't know where to look and search more.
    Truck was so good on old injectors, and problem started after replacing then with new
     
  10. bad-luck

    bad-luck Road Train Member

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    I think if I would start with the injectors, like I mentioned with the laser temperature gun
     
  11. daf105paccar

    daf105paccar Road Train Member

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