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07 D12C random power loss

Discussion in 'Volvo Forum' started by Sdatruckinginc, Jan 18, 2019.

  1. Jan 18, 2019 #1
    Sdatruckinginc

    Sdatruckinginc Bobtail Member

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    Jan 18, 2019
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    Been fighting this over a month now no pattern no air in fuel system power comes and goes no smoke or excessive blow by had cylinder eq test and inj test all passed ohm test on inj harness good new fuel lines still same prob. Tcs and abs light on but not constant if king pins worn causing loose steering would this cause a derate on steering sensor out 3 grand so far shops guessing no codes
     
    Sdatruckinginc, Jan 18, 2019
    Sdatruckinginc, Jan 18, 2019
    #1
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  3. Jan 18, 2019 #2
    BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Dec 5, 2013
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    I m Not sure ,but I would start with Fuel Pressure Regulator & EGR valve to make sure theyre "Not Sticking" Just what I d probably start at.
     
    BUMBACLADWAR, Jan 18, 2019
    BUMBACLADWAR, Jan 18, 2019
    #2
    Sdatruckinginc Thanks this.
  4. Jan 19, 2019 #3
    Sdatruckinginc

    Sdatruckinginc Bobtail Member

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    Jan 18, 2019
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    New regulator and egr check no probs even changed reg a second time thought I got a bad one
     
    Sdatruckinginc, Jan 19, 2019
    Sdatruckinginc, Jan 19, 2019
    #3
  5. Jan 19, 2019 #4
    BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Just throwing other stuff out there.Dirty MAF sensor screen,long fuel line sucking shut?
     
    BUMBACLADWAR, Jan 19, 2019
    BUMBACLADWAR, Jan 19, 2019
    #4
    Sdatruckinginc Thanks this.
  6. Jan 19, 2019 #6
    benrab

    benrab Medium Load Member

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    Apr 5, 2015
    Quebec ,Canada
    0
    Hi, on 2007 truck there is no Vest system(steering sensor, anti roll over protection) from factory except option, that feature was STD on 2008 and later?
    The easy way to know if your truck is equipped with VEST system, after engine fire up can you heard air brake application by the ABS system in the 12 seconds ? If so, you have that option.

    Note: on D12C there is no EGR valve or mass air flow sensor with screen.

    I recommand you first to pull out the boost sensor from intake manifold and clean it, it's normal you can see a lot of carbon on it (due of exhaust brake operation and valve train overlap).
    Second check closely the operation(stroke) of the air cylinder for the exhaust brake system on the turbo sometimes the air cylinder is sticking and generate a lot of back pressure and affect negatively the boost pressure without code.
    Ben
     
    benrab, Jan 19, 2019
    benrab, Jan 19, 2019
    #6
    Sdatruckinginc and QUALITYTRUCK Thank this.
  7. Jan 20, 2019 #7
    Sdatruckinginc

    Sdatruckinginc Bobtail Member

    46
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    Jan 18, 2019
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    Thanks gonna check boost sensor bout year old but will check that
     
    Sdatruckinginc, Jan 20, 2019
    Sdatruckinginc, Jan 20, 2019
    #7
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