Can someone describe their rattling cat for me....?
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Senior Member
Joined: Mar 2003
Posts: 422
Likes: 13
Can someone describe their rattling cat for me....?
I have this rattling/vibrating/humming coming from what I believe is the exhaust system. My idle is smooth as silk, but on occasions will experience a slight vibration that is exhaust related. I was thinking maybe it was the cat. Anyone with first hand experience with a bad cat, if you could just describe your experiences for me, I'd appreciate it....
MBWorld Fanatic!
Joined: Mar 2003
Posts: 3,445
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From: WOT somewhere in the Bay Area
1951 Caterpiller D6
Mine sounded like gravel rattling around in the pipes. The sound changes with RPM. Not a buzz or vibration sound at all. That might be the exhaust heat shield. It made a buzzing sound at certain RPMs.
Super Member
Joined: Jun 2002
Posts: 828
Likes: 1
From: Northern VA
SL 500
i had the exact same problem. i bet it's the cat converter. I had mine replaced at 35K. if you car is under warranty, you'll be covered. If not, i feel for ya, it will cost you around 800.00.
sadly, it's a common problem in Clks.
sadly, it's a common problem in Clks.
Super Member
Joined: Aug 2005
Posts: 514
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From: Normal, IL
02 E55; 99 CLK430 (Sold)
Originally Posted by TresX
Thanks for that.....well, thats encouraging.....my condition goes away if I accelerate even slightly. Oh well, I guess it's stage 1 all over again. Any other suggestions/experiences?
Newbie
Joined: Dec 2004
Posts: 10
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From: Hong Kong
CLK 230K & BMW 325Ci
Originally Posted by TresX
I have this rattling/vibrating/humming coming from what I believe is the exhaust system. My idle is smooth as silk, but on occasions will experience a slight vibration that is exhaust related. I was thinking maybe it was the cat. Anyone with first hand experience with a bad cat, if you could just describe your experiences for me, I'd appreciate it....
Senior Member
Joined: Mar 2005
Posts: 450
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From: Beantown
2003 clk55
Your car is covered under warranty for 70000 miles just for the catalytic convert considering i just had mine changed and wat a difference its so quiet and i can acutually hear my resonator delete now!
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MBWorld Fanatic!
Joined: Mar 2003
Posts: 3,445
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From: WOT somewhere in the Bay Area
1951 Caterpiller D6
Originally Posted by clk22
Your car is covered under warranty for 70000 miles just for the catalytic convert considering i just had mine changed and wat a difference its so quiet and i can acutually hear my resonator delete now!
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MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,905
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From: Atlanta
03 C32 AMG
I have the same little rattle in my car, its kindof annoying and i havent found any way to really test it so that i can look at it and see what's going on. Anyone have a link to a place that sells hi-flow Cats? I hear they're cheaper than OEM.
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Joined: Aug 2003
Posts: 3,927
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From: Vancouver, B.C.
2002 E55 AMG
Funny, I had my cats replaced on my '98 E320 4-5 months ago. Dealer said it was covered under warranty even though the warranty has never been renewed. 
LOL, I wanted to ask questions but didn't, simply said "ok!" Around $1000 CND.
LOL, I wanted to ask questions but didn't, simply said "ok!" Around $1000 CND.
