Marius's Touareg R5 life thread. - Page 81




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  1. #1601
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    pulled both in tank fuel pumps.

    both mesh screen filters are spotless.

    I'll replace the fuel filter again month end and take it from there.

  2. #1602
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    connected a clear hose to the return feed that goes from injector overflow back to pump.

    According to this...

    http://pics.tdiclub.com/data/517/PD_...very_check.pdf

    It should flow about 1.3liters per minute.

    Mine flowed only about 250ml per minute.

    This would indicate a bad tandem pump (newly installed when I changed the engine) or blocked fuel filter (new as well - less than 1000km on it).

  3. #1603
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    Man you are patient. There really is a lot to go wrong on this wagon. Is there a specialist that might be able to advise? Sometimes these complex vehicles need someone who has experience of the specific model. If you work from the pistons out what can go wrong? I think things are all good there due to the new engine. There after it can only be fuel or air related? Unless of course the leccy system is causing some issues on the fancy injectors. Is there a friendly specialist that you can bouce ideas off?

    Either way good luck.
    Cheers
    Stephen

  4. #1604
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    I wouldnt trust the dealer with this.

    They would start with injectors and continue replacing parts at my expense.

    I think im on my own on this but on the right track. I suspect the filter or tandem pump.

    The tandem pump could have been a dud. Eish!

    That's another R5k. Eina!

  5. #1605
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    Anyone got a few k lying around for Marius to:

    1.) move to Gauteng
    2.) Set up a small workshop for Tregs..

    I think many a person here would take their vehicle to you just from this thread
    IFS is like a swambo, soft, sexy and expensive!

    Apparently I need to make the airplane noises like mommy does when I try to spoon feed you the info..

  6. #1606
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    I do hope it is the filter, albeit unlikely. What if the whole drama is one of the lift pumps themselves. Perhaps one is performing worse as the fuel heats up?
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  7. #1607
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    Quote Originally Posted by Kortgat View Post
    I do hope it is the filter, albeit unlikely. What if the whole drama is one of the lift pumps themselves. Perhaps one is performing worse as the fuel heats up?
    With the draining of the tanks im confident the lift pumps are fine.

  8. #1608
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    Quote Originally Posted by pblaauw View Post
    Anyone got a few k lying around for Marius to:

    1.) move to Gauteng
    2.) Set up a small workshop for Tregs..

    I think many a person here would take their vehicle to you just from this thread
    Now you talking. Can we make it in cape town instead? Gauteng traffic is too much for me.

  9. #1609
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    Quote Originally Posted by MariusFourie View Post
    I wouldnt trust the dealer with this.

    They would start with injectors and continue replacing parts at my expense.

    I think im on my own on this but on the right track. I suspect the filter or tandem pump.

    The tandem pump could have been a dud. Eish!

    That's another R5k. Eina!
    The tandem pump is a mechanical device that will give a consistant fault,iow you will experience the misfire on every drive cycle.You have a intermittent fault and that is a electrical fault.
    98 Hilux 2.8D D/C 4x4

  10. #1610
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    Quote Originally Posted by wiel View Post
    The tandem pump is a mechanical device that will give a consistant fault,iow you will experience the misfire on every drive cycle.You have a intermittent fault and that is a electrical fault.
    Heat expansion will cause the tolerances in the pump to get worse and loose pressure more.

    Also, higher fuel temp requires a longer fuel injection. If the pump is not providing enough flow and pressure the longer injection requirement is not met.

  11. #1611
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    According to the PDF you attached earlier, low fuel flow, in your case by the blocked filter, can cause a tandem pumps demise as it then lacks lubrication due to insufficient fuel quantity and air being pumped.

    So now it all points back to the fuel again. There must be a way to get an independent opinion/test done on that.
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  12. #1612
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    Getting an independent test done and following up via legal costs will end up being more than just fixing the issue.

    Besides it will be impossible to pin it on the fuel station as too much time and distance has lapsed since the event.

  13. #1613
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    I don't know, but I do know I'd not back down that easily if I was convinced bad fuel has caused me these issues. Even out of principle I would not. Some have said its pointless, move on etc.. That is all fine and well if you had no further damage and the one injector you replaced put the thing to rest.

    I would 100% keep the correspondence going to allow you to re-address the matter should you need to. I.e. not a closed case for them.

    Back to the vehicle; I assume you still have your old tandem pump? If this is needed, think I'd put that and hope for the best. Pointless pouring more money in.
    2007 Touareg 3.0 V6 TDI (Facelift, Air, Rear Diff Lock, Rear Mounted Spare)
    2008 Audi A4 B8 2.0 TDI (Multitronic)
    2009 KTM 990 Adventure (Daily Commuter & Weekend Fun)
    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 50% of the time.


  14. #1614
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    The old tandem pump has been standing for over a year now.

    I wouldnt trust it. A failed tandem pump can allow diesel into the sump causing even more damage.

    I'll start with a me filter and retest return flow. If it's still out of spec ill save up for a tandem pump.

    As for fighting tne cause, i have lost all faith in the systems that are suppose to protect us since the ombudsman and CPA let me down with the initial engine. If I had no conscience I'd set a match to the car. Pretty bummed at the moment.

  15. #1615
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    Quote Originally Posted by MariusFourie View Post
    Heat expansion will cause the tolerances in the pump to get worse and loose pressure more.

    Also, higher fuel temp requires a longer fuel injection. If the pump is not providing enough flow and pressure the longer injection requirement is not met.
    Nou hoekom het die voertuig nie probleme gegee met elke drive cycle?
    98 Hilux 2.8D D/C 4x4

  16. #1616
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    To understand these new marvels of technology that we drive you need a degree in electrical engineering; a degree in electronic engineering; and a degree in mechanical engineering.

    Chris.

  17. #1617
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    Marius, just a thought: can you not connect up an inline 3 bar petrol pump, bypassing the tandem pump, and test that way? I'm not familiar with the treg's engine layout. At least you will then be certain that it is the tandem pump, and nothing else.

  18. #1618
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    Twice You had a problem after 30 mins driving from cold i presume. Then the misfire. The heat is causing an electrical fault maybe. Test a few times from cold and see if it recurs each time then start testing and eliminating what the cause could be. If it's mechanical maybe it's caused by an airlock or air getting into the system. Marius, i know you feel bummed but you will end up knowing more than anyone else in rsa with these vehicles. Keep going. If you want to do the high mileage like that guy with 774k kms then you on the right track.

  19. #1619
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    Quote Originally Posted by Kiboko View Post
    Twice You had a problem after 30 mins driving from cold i presume. Then the misfire. The heat is causing an electrical fault maybe. Test a few times from cold and see if it recurs each time then start testing and eliminating what the cause could be. If it's mechanical maybe it's caused by an airlock or air getting into the system. Marius, i know you feel bummed but you will end up knowing more than anyone else in rsa with these vehicles. Keep going. If you want to do the high mileage like that guy with 774k kms then you on the right track.
    Correct. It drives fine when cold but once fully warm it starts acting up. Hence why my previous test drive after blanking the egr didn't show issues. The test drive wasn't long enough.

    The thing that bugs me is that any electrical failure will be picked up by the ecu and store it as a code. VCDS doesn't show any codes so it has to be a physical issue. Hence my gravitation towards the filter or tandem pump.

    You inspire confidence. I just hope these school fees repays one day. if only at the very least it helps someone else avoid this headache.

  20. #1620
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    Quote Originally Posted by ChrisLab View Post
    To understand these new marvels of technology that we drive you need a degree in electrical engineering; a degree in electronic engineering; and a degree in mechanical engineering.



    Chris.

    No, according to Jeremy Clarkson, you just need a bigger hammer... ;-)))

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