CL500 - First Problem

Discussion in 'Engine' started by BigJock2005, Sep 20, 2011.

  1. BigJock2005

    BigJock2005 New Member

    Messages:
    3
    Joined:
    Sep 19, 2011
    Car:
    CL500
    Hello Everyone

    I'm new to the forum just having bought a 2002 CL500 with 74k on the clock - see my brief on the new members introduction page. I got the car for a good price (I think) as it has a funny noise. Most sensible people would walk away of course, but my dysfunctional brain took a risk and grabbed a bargain.

    When the motor is really warmed up (like after my first drive at @*? mpg along the M4) then I have a light metallic rattling from beneath the drivers seat. It's present at idle (so not road speed related) and also when either cruising under engine brake, or driving on light throttle.

    On searching the forums, it seems that broken-up cats are a common problem. I will jack her up tomorrow and give the rear cans a bash and see if I can hear anything.

    Some have said that damaged cats can wreck the motor - any views on this. I would have thought that the rear cats are quite far from the motor, and the gas flow is clearly the right way to carry crap AWAY from the motor.

    I've attached a sound file from my phone in which you can hear the noise clearly. I am blipping the throttle while stationary in Park.

    Is a broken cat likely, and if that's what it is can I drive her until I get it replaced?

    Any advice appreciated.

    Thanks!
    Jock
     
  2. Howard

    Howard MB Club Veteran

    Messages:
    18,624
    Joined:
    Apr 23, 2004
    Location:
    Toad Hall
    Car:
    CLS 500 / A 150
    Hi Jock

    Just remove the secondary cats if they are rattling ( the car will still pass an MOT without them ). Improves the sound of the car as well ;)

    Either put a straight through pipe in their place or get your local garage to cut them open , take out the contents and weld them back up.

    Welcome on board by the way.
     
  3. LTD

    LTD MB Club Veteran

    Messages:
    5,442
    Joined:
    May 21, 2009
    Location:
    Planet Earth
    Car:
    Yep, one of THOSE !!!
    Had the same problem recently on my S500.

    Secondary cat was rattly - both cats cut out and replaced by a piece of straight pipe.

    Problem solved.
     
  4. johnsco

    johnsco Hardcore MB Enthusiast

    Messages:
    2,014
    Joined:
    Nov 22, 2008
    Location:
    Leeds, West Yorkshire
    Car:
    E280CDI SPORTS ESTATE
    I've done the same on the E430 ... Removed secondary cats.

    Also check for rattle of the various aluminium heat shields around the exhaust.
    The mountings tend to fail and then they rattle and clatter at various speeds.
     
  5. cl55 amg

    cl55 amg Hardcore MB Enthusiast

    Messages:
    561
    Joined:
    May 28, 2009
    Location:
    Manchester
    Car:
    CL55 AMG
    As above done the same, and it sounds a lot better..
     
  6. BTB 500

    BTB 500 MB Club Veteran

    Messages:
    18,552
    Joined:
    Aug 7, 2005
    Location:
    Berkshire
    Car:
    R129 SL500, W639 Vito 120, S203 C230
    If you do end up getting the secondary cats removed this should be declared as a modification to your insurer.
     
  7. OP
    OP
    BigJock2005

    BigJock2005 New Member

    Messages:
    3
    Joined:
    Sep 19, 2011
    Car:
    CL500
    Thanks guys, I think the cats are coming out....
     
  8. m2287

    m2287 Hardcore MB Enthusiast

    Messages:
    3,051
    Joined:
    Jan 27, 2010
    Location:
    cambridge
    Car:
    Bentley Continental GT
    done the same to my cl55!
     

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