Unusual Rattle/Noise - can anyone help please?

Discussion in 'Engine' started by Cakesparky, Oct 27, 2011.

  1. Cakesparky

    Cakesparky New Member

    Messages:
    7
    Joined:
    Oct 11, 2011
    Location:
    London (for now)
    Car:
    SL500 'Designo' in Black with AMG extras
    Hi all,

    My beloved SL 500 (2002) has developed a loud rattle/scraping noise when the accelerator is depressed. Not exclusively then, as it also does it when 'freewheeling'.
    (54,000 miles on the clock - recently had full service.

    The noise is definitely NOT from the engine block.

    A Mercedes dealer diagnosed that a piece of the Cat material had broken away and was rattling around loose - as a result I had 2 after market Cats fitted and the noise seemed to stop for a few days.

    Now the noise is back - I'll describe it as best I can.
    It's like a piece of loose metal is either trailing the ground (I've checked and of course it's not) --- or like a small piece of metal or debris inside a drum rattling round....It most commonly occurs when gears are engaged, but also does it when standing idling in neutral.

    I'm in the middle of a grand tour of Europe and have a 1000 mile journey home in the next few days - and want to be reasonably confident it's not a terminal fault!! At least it might make it home to my local workshop!

    Can anyone suggest any possible causes?

    Thanks!
     
  2. Tinkerer

    Tinkerer Hardcore MB Enthusiast

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    Location:
    Norfolk
    Car:
    W210 E220 CDi
    I had something very similar to that and when I took it to my local indy he informed me, with a big grin on his face, that I had a loose exhaust pipe clamp! £10 and it was like a new car .... sorted!
     
  3. BTB 500

    BTB 500 MB Club Veteran

    Messages:
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    Location:
    Berkshire
    Car:
    R129 SL500, W639 Vito 120, S203 C230
    There's a known issue with the R230 where a baffle comes loose in the fuel tank, rattling around. Could it be that?
     
  4. OP
    OP
    Cakesparky

    Cakesparky New Member

    Messages:
    7
    Joined:
    Oct 11, 2011
    Location:
    London (for now)
    Car:
    SL500 'Designo' in Black with AMG extras
    Thanks guys - I'll have them both checked out when get back to Blighty!

    Any other suggestions all very welcome....
     
  5. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    C43 AMG with a 55 engine and supercharger, E55 AMG, S500, etc
    I would be looking at the cats again. Cheapo non gen cats are just not worth it IMO.
     
  6. BTB 500

    BTB 500 MB Club Veteran

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    R129 SL500, W639 Vito 120, S203 C230
    Surely even aftermarket cats wouldn't fail after 2 days ? :eek:
     
  7. OP
    OP
    Cakesparky

    Cakesparky New Member

    Messages:
    7
    Joined:
    Oct 11, 2011
    Location:
    London (for now)
    Car:
    SL500 'Designo' in Black with AMG extras
    No, don't think it's the Cats failing - suspicion is a mis-diagnosis by the Merc guy, and I've shelled out £800 on 2 cats it probably didn't need!
    Will know more when I get back to UK from Monte Carlo... Expensive enough place without breaking down here...
     
  8. AMG19

    AMG19 Hardcore MB Enthusiast

    Messages:
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    Location:
    Surrey
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    Exhaust pipe clamps and the chumps that fitted the 'mickey mouse' exhaust cats didnt buy a new fitting kit?
     

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