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2.0 tdi 140 rough idle EGR valve throttle body

Discussion in 'A3/S3/Sportback (8P Chassis)' started by maffew, Apr 23, 2013.

  1. maffew

    maffew Member

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    Hey guys,
    Been having serious rough idle issues with my A3 and also a 'lack of boost' - starts to boost then stops then carries on a few seconds later.

    Anyways - after reading plenty of threads I decided to take off the EGR valve and give that a thorough clean - wouldn't believe how much soot came out!! I did the same with the throttle body while I was there and also the hose directly under the throttle body.

    When starting up it puffed out a lot of black smoke when revving hard - guessing this is a load of soot that's been dislodged?

    Upon taking her for a drive - the boost issue is still there (it may have improved SLIGHTLY - only saying 'may' as I could be just expecting it to have? if this makes sense. Also the rough idle has not improved one bit - it idles at about 820rpm - very juddery on idle - rev counter does not move at all.

    Any one got any ideas what this could be? Driving me mad..! :)
     
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  3. maffew

    maffew Member

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    Anyone got any ideas at all? From what I've read the juddering on idle is pretty common on these so someone must have successfully sorted it out? Cheers in advance :)
     
  4. Rhyso

    Rhyso Well-Known Member
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    You still have a boost leak in the system by the sounds of it

    Check the boost pipes going into the intercooler

    EDIT - reRead; sticking turbo vanes?
     
  5. maffew

    maffew Member

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    Boost pipes going into the intercooler are good.
    I was going to look into the sticky vane issue - this is the actuator rod isn't it?
    I was advised that it shouldn't be this, and that only overboost is down to the sticky vane? Correct me if I'm wrong though as I of course want to sort this out! As a side note, is this likely to cause the rough idle? Or just the boost issue?
    Cheers!
     
  6. maffew

    maffew Member

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    *Bump* :)
     
  7. Rodney5950

    Rodney5950 Member

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    Ive just replaced my DMF and clutch, EGR, MAf, injector loom, throttle body, fiddled with my idle and i still have a rough, juddering loud 2.0tdi, im all out of ideas now?
     
  8. CHEZ

    CHEZ moderately amusing
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    get it scanned and check your injector readings
     
  9. Rodney5950

    Rodney5950 Member

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    ive scanned it and the injectors are fine, could the leaking boost pipes affect idling?
     
  10. CHEZ

    CHEZ moderately amusing
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    i would not say the idle would be affected, but could be wrong as there many variables!
    just out of curiosity, is your fuel filter newish? and are the pipes to and from this ok?
     
  11. Rodney5950

    Rodney5950 Member

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    the fuel filter is about 2000miles old now, pipes seem okay yeah
     
  12. max69vk

    max69vk Active Member

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    Check your torsion value & more importantly the rear cam position. Less than 2mm movement on the rear pulley and these cars idle like cack!
     
  13. maffew

    maffew Member

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    Yeah I've replaced Throttle Body and about to change EGR anyway but not holding out much hope this will cure it. Car idle is terrible sometimes - bouncing up and down, getting sick of it doing my head in lol. People say I worry too much about little things, but it's little things that wind me up lol.
     
  14. maffew

    maffew Member

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    I'm useless with anything like that- is there anything obvious I can look for when looking at this? Sorry never touched stuff like this before. :)
     
  15. tdi-man

    tdi-man Well-Known Member

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    I have an egr valve for sale if you need 1 only 6 months old inbox me if interested
     
  16. max69vk

    max69vk Active Member

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    Have a look on the forum for the VCDS map & it should help you find someone who has the equipment to measure the required readings. To do the job is easy, slacken 3 bolts on the front cam adjust & tighten, then do the same with the rear! Do a seach for torsion value & all will be explained :)
     
  17. Rodney5950

    Rodney5950 Member

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    im totally stumped by my car now, i have also replaced throttle body, egr, injector loom, maf,dmf and clutch, ive also blanked the egr and still the same, reason being i still had the egr fault showing although its new, i adjusted the idle speed and its just as bad as before
     
  18. tdi-man

    tdi-man Well-Known Member

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    checked timing ? set idle to 800 ? timing out can cause this problem
     
  19. Rodney5950

    Rodney5950 Member

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    i have VCDS, in terms of timing adjustment, is this something i can heck and change myself, i have set idle to 800 but it just jumps up and down from 800-845
     
  20. Rodney5950

    Rodney5950 Member

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    My torsion Value is 6.6...should this not be 0.05?
     
  21. SAiLO

    SAiLO Well-Known Member
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    Should be as close to 0.00 as possible.
     
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  23. tdi-man

    tdi-man Well-Known Member

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    vcds does not show the rear cam settings .
     
  24. Rodney5950

    Rodney5950 Member

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    my mechanic had a check a different bit of kit, hes not sure how to sort it though...can anyone help:)
     
  25. max69vk

    max69vk Active Member

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    6.6? Thats right at the edge of adjustment! BKD runs best at 0.5.

    Was this measurement taken when the car was up to fully working temp? If not that will skew things massively. Get him to adjust the front cam pulley to set the torsion value, then visually set the rear cam to match.
     
  26. Rodney5950

    Rodney5950 Member

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    everywhere ive rung is claiming that this is a 6 hour job and requires a lot of work which just makes me think they wont actually know what they are doing, i will drive anywhere in the country if someone can sort this for me for £ obviously
     
  27. tdi-man

    tdi-man Well-Known Member

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    set flywheel mark to TDC THEN MOVE FRONT CAM AND PIN IT THEN MOVE REAR CAM AND PIN IT . TIGHTEN UP
     
  28. Rodney5950

    Rodney5950 Member

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    i havent the tools nor confidence to carry this out myself...how about i pay you to do it :p
     
  29. tdi-man

    tdi-man Well-Known Member

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    IVE SEEN IT DONE
     
  30. Rodney5950

    Rodney5950 Member

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    is it something you could do you recon?
     
  31. tdi-man

    tdi-man Well-Known Member

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  32. tdi-man

    tdi-man Well-Known Member

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    these sorted my car out for me set timing and then adjusted injector timing
     
    Rodney5950 likes this.

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