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Low fuel pressure and misfire?

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  • Low fuel pressure and misfire?

    I have a 3.2 litre V6 with 96,000km. A few times recently the engine has hiccupped and lost power briefly. On each occasion I was turning left onto a main road and accelerating away. At the time I thought it might be a fuel surge problem when the fuel tank was low or near empty. VCDS has reported a fault frequency of 5 and has logged:

    012555 - Low Pressure Fuel regulation
    P310B - 008 - Fuel Pressure Outside Specification – Intermittent

    000401 - Fuel Pressure Sensor (G247)
    P0191 - 002 - Implausible Signal – Intermittent

    Then today when accelerating up a hill, again with a low fuel tank and the car showing 30km to empty, the engine misfired and the check engine light flashed on and off for maybe 5 or 10 seconds. VCDS has determined today’s event as:

    000768 - Random/Multiple Cylinder Misfire Detected
    P0300 - 001 - - Intermittent

    000773 - Cylinder 5
    P0305 - 001 - Misfire Detected – Intermittent

    000774 - Cylinder 6
    P0306 - 001 - Misfire Detected - Intermittent

    Does anyone have any thoughts regarding the root cause?
    2007 Passat B6 3.2 litre V6 4Motion | Granite Grey | standard 17" Solitude wheels | tow bar
    Mods: R36 steering wheel | HP DQ250 DSG tune | HPA Haldex performance controller | Koni sports yellow shocks | Eibach springs | H&R sway bars | Whiteline ALK | Kufatec E-MFA add on | Garage door button | Warning triangle retrofit | Bridgestone Potenza Adrenalin RE003s

  • #2
    Might be as simple as not letting the fuel get so low in the tank. Does it happen when you have more fuel in the tank?
    B9 Audi SQ5

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    • #3
      Hasn't happened on a healthy tank of fuel that I can recall recently. I've got a full tank now so I try to provoke it.
      2007 Passat B6 3.2 litre V6 4Motion | Granite Grey | standard 17" Solitude wheels | tow bar
      Mods: R36 steering wheel | HP DQ250 DSG tune | HPA Haldex performance controller | Koni sports yellow shocks | Eibach springs | H&R sway bars | Whiteline ALK | Kufatec E-MFA add on | Garage door button | Warning triangle retrofit | Bridgestone Potenza Adrenalin RE003s

      Comment

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