06 D12 hard start

Discussion in 'Volvo Forum' started by dorlia2, Dec 8, 2021.

  1. dorlia2

    dorlia2 Light Load Member

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    I am dealing with a problem with prolonged start on a 06 D12 engine since it became colder in the midwest.
    Already checked for fuel leaks and replaced the water separator filter, main fuel filter, fuel return valve, installed new priming pump assembly. I don't see any bubbles in the fuel tanks while engine is running nor any bubbles in the water separator sight glass. Also there is no coolant leak or overpressure in the surge tank. Priming the fuel pump does not help, after a couple pumps the plunger becomes stiff.
    Any ideas would be greatly appreciated
    Batteries and starter are good. After sitting overnight the engine struggles to start as if there is not enogh fuel in the head, sputtering and blowing white smoke for a second when starting.
    No codes on the dash or ToolTech
     
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  3. ibcalm19

    ibcalm19 Road Train Member

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    Try this don't know if it will verify the problem ( I believe it's air in the line or losing its prime) Have your tanks filled to capacity when you shut it down & see if you still have a hard start when you fire it back up.
     
  4. dorlia2

    dorlia2 Light Load Member

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    Last edited: Dec 8, 2021
  5. ibcalm19

    ibcalm19 Road Train Member

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    I don't know for sure just a suggestion. More diagnosis has to be done to pin it down.
     
  6. dorlia2

    dorlia2 Light Load Member

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    Any diagnostics I can do to pinpoint the problem
     
  7. dorlia2

    dorlia2 Light Load Member

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    Anybody in Chicago area that can take a look at this?
     
  8. dorlia2

    dorlia2 Light Load Member

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    Anyone in Chicago area that can take a look at this?
     
  9. dorlia2

    dorlia2 Light Load Member

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    repost
     
    Last edited: Dec 14, 2021
    Reason for edit: repost
  10. flood

    flood Road Train Member

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    Sound like a bad injector cup
     
    dorlia2 Thanks this.
  11. Rob100100

    Rob100100 Light Load Member

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    Your best bet for Chicago land is
    nasriza

     
    loudtom and dorlia2 Thank this.
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