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Thread: High Fuel Pressure specified vs actual

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  1. High Fuel Pressure specified vs actual 
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    Hi, our 2009 Golf 6 went to limp home today, flashing glow plug mode. No CEL and the flashing glow plug goes away after a cooling off and a re-start. So armed with VCDS we drive for 10 minutes and the limp home happens again. VCDS reported this (the 2 frequency corresponds so this is a new today fault)

    Address 01: Engine (CBA) Labels: 03L-906-022-CBA.clb
    Part No SW: 03L 906 022 LA HW: 03L 906 022 G
    Component: R4 2,0L EDC G000SG 6172
    Revision: 13H01--- Serial number:
    Coding: 0001072
    Shop #: WSC 01357 011 00200
    VCID: 6FED6F877E641660C8F

    1 Fault Found:
    000135 - Fuel Rail/System Pressure
    P0087 - 000 - Too Low
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 2
    Fault Frequency: 2
    Mileage: 93207 km
    Time Indication: 0
    Date: 2104.14.03
    Time: 15:57:33

    Freeze Frame:
    RPM: 2093 /min
    Inj. Quantity: 44.2 mg/str
    (no units): 5.0
    Pressure: 1272.0 bar
    Pressure: 976.0 bar
    Temperature: 45.0C
    Tank Cont.: 24.4 l

    Readiness: 0 0 0 0 0

    So I logged the fuel pressures for a a short journey to verfiy. To me the specified and actual look to be tracking albeit the actual is a little laggy but then it is a mechanical control system in there somewhere. The max error I see using the log file and excel is about 50bar. So my question is - should the values track a LOT closer than you see in the attachment? Can you see anything wrong? What other channels should I be logging? This is in limp home mode flashing glow plug light;

    Fuel pressure.jpg


    I think I can guess the answer to this but now there is a audible from inside the car whirring noise, lift the bonnect and the noise is from the left side rear of the engine.
    Plan to pull the fuel filter, look for particles to give the me the next step.
    I understand the HPFP is at the front left of the engine but is there another pump pre filter buried at the bulkhead?
     
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  2. Re: High Fuel Pressure specified vs actual 
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    So, we inspected the engine bay diesel filter and this looks clean, very clean, and looking into the pump in the diesel tank looks clean too. Back into the engine bay, the pressure regulator on the mechanical high pressure pump also looks clean - so we're progressing along the lines of a pressure regulator on the end of the common rail line - maybe this being faulty gives us the bussing sound?

    Contribution welcome.
    2009 2.0 GT 140, Candy white, Sienna leather, heated seats, 18" Bilbao
    2004 2.0 SDI, Blue, heated seats, auto lights,
     
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