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Is my cat knackered?

hellierlee Feb 23, 2012

  1. hellierlee

    hellierlee New Member

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    Got a 2004 Audi a4 1.8t s line. Ok story goes I have had a tapping noise coming for a while now and yesterday I just lost all power, and it stalls when idle. I can rev it and it stays running but it won't drive, just creeps along. My friend has said it could be your cat knackered so just seeing your thoughts? Many thanks
     
  2. StuG808

    StuG808 1.9tdi130 Avant FailWheelDrive

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    I don't know Audi's that well, but I know cars, and that really doesn't sound like a knackered cat. Your friend might be mistaking it for the lamda sensor which is usually on the cat, or downpipe, but it wouldnt affect it that badly.
     
  3. hades-

    hades- Well-Known Member VCDS Map User

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    have you got any warning lights up ?
    id get it on vcds or a scanner b4 you change the cat
    could be anything
     
  4. hellierlee

    hellierlee New Member

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    He actually said it could be a blocked cat. So he reckons I should take the cat of and see if the car runs then without stalling. Then obviously if it runs then the fault points to my cat
     
  5. StuG808

    StuG808 1.9tdi130 Avant FailWheelDrive

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    Well, as noted it could be anything. Probably easier getting a garage to run a diagnostic on it that taking the cat on-and-off.
     
  6. hellierlee

    hellierlee New Member

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    True but can't get it to a garage lol
     
  7. hades-

    hades- Well-Known Member VCDS Map User

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    if your mate is so sure its the cat get him to prove it by removeing
     
  8. Paul100

    Paul100 Member

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    hang on i have a photo of a knackered cat somewhere, it may help. I will dig it out....
     
  9. hades-

    hades- Well-Known Member VCDS Map User

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    knackerd cat

    [​IMG]
     
  10. AudiLeon

    AudiLeon Well-Known Member VCDS Map User

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    It is entirely possible. How hot is it getting if it does run? Does it smell of rotten eggs?

    Get it off, smash the internals of the cat out with a pole and run it. Extra bhp and easy fix.
     
  11. Paul100

    Paul100 Member

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    ]here it is...................





    [​IMG]
     
  12. Paul100

    Paul100 Member

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    hate it when someone else finishes off your joke.............................
     
    Last edited: Feb 23, 2012
  13. Paul100

    Paul100 Member

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    Wont that fail an emmissions test at MOT time?
     
  14. hades-

    hades- Well-Known Member VCDS Map User

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    if it is the cat and you smash it out
    it will sound ****e
     
  15. AudiLeon

    AudiLeon Well-Known Member VCDS Map User

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    Probably not tbh
     
  16. hades-

    hades- Well-Known Member VCDS Map User

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    its a petrol so removeing or smashing the internals out of the cat will fail the mot
     
  17. AudiLeon

    AudiLeon Well-Known Member VCDS Map User

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    I've had a car pass an mot without a cat.
     
  18. hades-

    hades- Well-Known Member VCDS Map User

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    pre a certain yeah they do pass but the a3 wont
    what car was it ?
     
  19. AudiLeon

    AudiLeon Well-Known Member VCDS Map User

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    A 97 Vectra V6
     
  20. docurley

    docurley Moderator Staff Member Moderator

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    Dose the CAT glow red if you keep the car running for a while also look in the VAGCOM/VLC section and post up there to see if someone is local to you and would not might scanning the car. Another option is by one of thouse had scanners of ebay there basic but will let you know if you have any code and comes with a book to tell you what the problem is.
     
  21. StuG808

    StuG808 1.9tdi130 Avant FailWheelDrive

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    I would really advise getting it properly diagnosed, there must be mobile vagcom people around? It 'might' be the cat, but only as much as it might be anything else: fuelling problem/diagnostic shutdown mode/internal failure etc. And removing a cat can be a pain in the backside: a whole afternoon of rolling around under the car hoping that the studs wont snap and having to replace the gaskets, and chances are it may not fix it.
     

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