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how do i check tdi pump timing

Discussion in 'VCDS (formerly VAG-COM) forum' started by olds_kool, Aug 5, 2008.

  1. olds_kool
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    olds_kool Active Member VCDS Map User

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    [Aug 5, 2008]
    hope someone can help me out

    i sometimes have difficulty starting my 2.5 tdi, (turns over but wont fire up for ages, seems worse when hot)
    ive changed plugs, temp sender and breather, reading a few other threads i would like to check fuel pump timing but would like simple instructions so i dont mess anything up

    if it is out, is it easy to adjust or best left to a pro

    thanks in advance for any help
    #1
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  3. Caesium
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    Caesium My BM is fixed!

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    [Aug 5, 2008]
    if it were pump timing then you'd have hordes of smoke out of the exhaust or knocking, it sounds like an air leak to me.
    Does it run okay when you get it going?
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  4. olds_kool
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    olds_kool Active Member VCDS Map User

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    [Aug 5, 2008]
    if it starts first time no smoke that you would notice, if it turns over for a while then there is a big cloud,
    runs poor when cold (doesnt want to rev over 3k) but seems ok when warmed up possibly a little down on power
    have had these fault codes
    00519 - intake manifold pressure sensor (G71)
    31-00 - open or short to ground
    00575 - intake manifold pressure
    08-00 - control limit surpassed

    looked them up and they suggest knackered turbo and car shouldnt even run but turbo seems fine and not sure if they are related to poor starting
    #3
  5. Caesium
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    Caesium My BM is fixed!

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    [Aug 5, 2008]
    Probably a duff sensor then, check inside the turbo intake and see if there is any oil.
    What colour is the smoke cloud you mention?

    Black is diesel, white or blue is oil.
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  6. olds_kool
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    olds_kool Active Member VCDS Map User

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    [Aug 5, 2008]
    what would oil suggest? had front apart to fit new belt / tensioner and noticed some oil in hose from intercooler.
    thick grey smoke when poor start but nothing when running
    do turbos wear out or just work or not work, car has 208,000+ miles on it
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  7. olds_kool
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    olds_kool Active Member VCDS Map User

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    [Aug 5, 2008]
    found instructions on ross tech site of all places:think:
    i did look there but website isnt laid out that well, found page when i googled
    http://www.ross-tech.com/vag-scope/TDIGraph.html

    will check tommorrow, bit parranoid my turbos on its way out now
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  8. Caesium
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    Caesium My BM is fixed!

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    [Aug 6, 2008]
    Sounds like the turbo shaft oil seal has started to deteriorate. These are common on all turbos. Its quicker to happen in a petrol engine as the exhaust is wetter and more acidic.

    You'll need to get it reconditioned or replaced.
    #7

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