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Start up judder, help!

jri91 May 3, 2017

  1. PeteS307

    PeteS307 Registered User

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    Seems like there's a lot of causes for this judder on start up. I recently paid for a manual carbon scrape and it sorted the issue out it for a short period of time but now its back again.. feel like banging my head against a wall.. Can't think of anything else that could cause it apart from already mentioned on here?
     
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  3. Rideen

    Rideen Registered User

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    Well, I have never gotten to the bottom of it, I've let the new owner have headaches with it.

    Possible list of causes is long but here it goes:
    • Glow plug(s)
    • Injector(s)
    • Battery
    • Starter motor
    • Cracked cylinder head
    • Bad compression
    • Timing
    • Engine mounts
    • DMF
    • Gearbox (if clutch is not pressed when starting)
     
    PeteS307 likes this.
  4. millsy4002

    millsy4002 Registered User

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    Add bad earthing to that list, that was my cause


    Sent from my iPhone using Tapatalk
     
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  5. aqibi2000

    aqibi2000 Registered User

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    Mine has the exact same symptom of metallic noises when sat overnight and smoke. I'm more than convinced from my own research that it's the exhaust cam advanced timing causing this. I'll be adjusting the cams sometime this week and get back
     
    Last edited: Jun 19, 2017
  6. Rideen

    Rideen Registered User

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    This seems very likely, a very experienced mechanic asked me if I ever changed camshafts (which I did) and he said this could be the cause since I've put reinforced camshafts with the new cylinder head. It's worth a check for sure.
     
  7. PeteS307

    PeteS307 Registered User

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    Not sure what you mean by metallic noises lads? I'm getting a little smoke from the exhaust and the violent juddering on start up from mine. Getting the DMF checked today.. (clutch press to start) I've noticed a knocking sound that can be felt through the bottom of the car while holding on biting point.. it's exaggerated when holding the clutch going up an incline/hill.
     
  8. Rideen

    Rideen Registered User

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    I would advise checking for axial play inside the gearbox as well as this can show the same symptoms as failing DMF, people change DMF and it continues happening = axial play inside gearbox.
     
  9. PeteS307

    PeteS307 Registered User

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    Thanks I'll take a look at this also today.
     
  10. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    probably injector leaks into combustion chamber, if you starting it and judder, turn it off and start again, should start normally.
     
  11. jri91

    jri91 Registered User

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    Hi bud, booked in for diognostics next week.. Ill keep you posted!
     
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  13. jri91

    jri91 Registered User

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    A few things i noticed this morning as car took a few trys to start up...

    1st attempt - judder
    2nd attempt - automatic lights failure symbol appeared
    3rd attempt - automatic lights symbol gone, car started but radio was off?
     
  14. Rideen

    Rideen Registered User

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    My car used to do this as well. Randomly throwing auto lights error when they were working properly.
     
  15. Svenedin

    Svenedin Registered User

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    Surely everything is pointing to this being electrical (more likely than not)? There may be other problems as well. The OP hasn't said that he's changed the (sounds very old) battery or even checked the terminal and earthing connections. This would be a good start.....Theres no point changing glow plugs yet until they are tested with enough power!
     
  16. jri91

    jri91 Registered User

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    I do feel there may be more than one issue here
     
  17. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    Can be, but it's all about diagnose them (by checking) and eliminate.
     
  18. jri91

    jri91 Registered User

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    Had it looked at today, apparently its 99.9% the dual mass flywheel?
     
  19. jri91

    jri91 Registered User

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    So ive looked back at my old paper work for the car and noticed i already have had the dmf done before so as per my last message the garage i went this morning must be talking rubbish?
     
  20. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    do you hear rattling other than judder when pressing or depressing clutch while driving?
     
  21. jri91

    jri91 Registered User

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    Its automatic
     
  22. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    how you could get done dmf then. automatic got torque converter not clutch itself (unless dsg that got dual clutch but still net dmf). can be also bolt from flywheel loose
     
  23. Rideen

    Rideen Registered User

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    I changed 2 DMFs in 2 years on old 2.0 TDI manual. And I've went with the most expensive DMFs, Sachs or LUK they were I think.

    PS: DSG is a twin shaft twin clutch preselector automatic and does need a DMF to protect the transmission from too much sudden torque transfer.
     
  24. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    sachs is provider of the oem parts, luk is cheaper and seen much more negative opinion about it.
     
  25. Rideen

    Rideen Registered User

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    Just found old bills, one was Sachs, the other one was LUK. LUK was more expensive though @700 Euros.
     
  26. Marek196c

    Marek196c Gilera Runner / A3 Sportback

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    lol 2 years ago when I was looking for mine (manual) sachs was more expensive (like luk was 300£, sachs 400£) as well the old one (audi oem) was sachs as well. But as far as I looked after it in forums, opinions etc, in 90% sachs was better quality and more durable. however dunno about costs of automatic ones.
     

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