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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
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    maffew Member

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    [Apr 23, 2013]
    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..! :)
    #1
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  3. maffew
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    maffew Member

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    [Apr 23, 2013]
    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 :)
    #2
  4. Rhyso
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    Rhyso Active Member VCDS Map User

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    [Apr 23, 2013]
    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?
    #3
  5. maffew
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    maffew Member

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    [Apr 23, 2013]
    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!
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  6. maffew
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    maffew Member

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  7. Rodney5950
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    Rodney5950 Member

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    [Apr 24, 2013]
    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?
    #6
  8. CHEZ
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    CHEZ moderately amusing

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    [Apr 24, 2013]
    get it scanned and check your injector readings
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  9. Rodney5950
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    Rodney5950 Member

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    [Apr 24, 2013]
    ive scanned it and the injectors are fine, could the leaking boost pipes affect idling?
    #8
  10. CHEZ
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    CHEZ moderately amusing

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    [Apr 24, 2013]
    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?
    #9
  11. Rodney5950
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    Rodney5950 Member

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    [Apr 24, 2013]
    the fuel filter is about 2000miles old now, pipes seem okay yeah
    #10
  12. max69vk
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    max69vk Active Member

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    [Apr 25, 2013]
    Check your torsion value & more importantly the rear cam position. Less than 2mm movement on the rear pulley and these cars idle like cack!
    #11
  13. maffew
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    maffew Member

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    [Apr 25, 2013]
    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.
    #12
  14. maffew
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    maffew Member

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    [Apr 25, 2013]
    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. :)
    #13
  15. tdi-man
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    tdi-man Well-Known Member

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    [Apr 25, 2013]
    I have an egr valve for sale if you need 1 only 6 months old inbox me if interested
    #14
  16. max69vk
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    max69vk Active Member

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    [Apr 25, 2013]
    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 :)
    #15
  17. Rodney5950
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    Rodney5950 Member

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    [Apr 29, 2013]
    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
    #16
  18. tdi-man
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    tdi-man Well-Known Member

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    [Apr 29, 2013]
    checked timing ? set idle to 800 ? timing out can cause this problem
    #17
  19. Rodney5950
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    Rodney5950 Member

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    [Apr 30, 2013]
    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
    #18
  20. Rodney5950
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    Rodney5950 Member

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    [Apr 30, 2013]
    My torsion Value is 6.6...should this not be 0.05?
    #19
  21. SAiLO
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    SAiLO Enthusiast VCDS Map User

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    [May 1, 2013]
    Should be as close to 0.00 as possible.
    #20
  22. tdi-man
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    tdi-man Well-Known Member

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    [May 1, 2013]
    vcds does not show the rear cam settings .
    #21
  23. Rodney5950
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    Rodney5950 Member

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    [May 1, 2013]
    my mechanic had a check a different bit of kit, hes not sure how to sort it though...can anyone help:)
    #22
  24. max69vk
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    max69vk Active Member

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    [May 1, 2013]
    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.
    #23
  25. Rodney5950
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    Rodney5950 Member

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    [May 3, 2013]
    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
    #24
  26. tdi-man
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    tdi-man Well-Known Member

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    [May 3, 2013]
    set flywheel mark to TDC THEN MOVE FRONT CAM AND PIN IT THEN MOVE REAR CAM AND PIN IT . TIGHTEN UP
    #25
  27. Rodney5950
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    Rodney5950 Member

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    [May 3, 2013]
    i havent the tools nor confidence to carry this out myself...how about i pay you to do it :p
    #26
  28. tdi-man
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    tdi-man Well-Known Member

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    [May 3, 2013]
    IVE SEEN IT DONE
    #27
  29. Rodney5950
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    Rodney5950 Member

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    [May 3, 2013]
    is it something you could do you recon?
    #28
  30. tdi-man
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    tdi-man Well-Known Member

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    [May 3, 2013]
    #29
  31. tdi-man
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    tdi-man Well-Known Member

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    [May 3, 2013]
    these sorted my car out for me set timing and then adjusted injector timing
    #30
    Rodney5950 likes this.

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