I've been reading up on the topic of cat's gone bad herein and suspect mine is up to no good as it rattles profusely. I suspect that the performance chip may be the culprit, anyone else have a bad experience chipping their car, or have to repace cat recently?

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RJ
'92 500E
'75 Triumph TR 6

If it's rattling, see if it's just the heat shield(s)

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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo

Thanks, but no, it's definitely the cat.

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RJ
'92 500E
'75 Triumph TR 6

I would check to see if your heat shield is loose.

Save your money.

If your cat was really bad you'd have a serious reduction in power.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

ouch...cats for the 500E are $$$$$$$$$$$$$$$$$$$$$$$$$$.

just replaced one of ours to the tune of $2400CDN. that's just for the cat. no labour.

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'94 W124.036 249/040 leder; 8.25x17 EvoIIs
'93 W124.036 199/040 leder; 8.25x17 EvoIIs, up in flames...LITERALLY!
'93 W124.036 481/040 leder; euro delivery; 8.25x17 EvoIIs
'88 R107.048 441/409 leder; Euro lights
'87 W201.034 199/040 leder; Euro lights; EvoII brakes; 8x16 EvoIs - soon: 500E rear brakes
'70 R113.044 050/526; factory alloys; Euro lights

My cats in my 92 400E rattle too. Actually, its just one side. I do have a chip. But Ive also had a thermostat that was stuck open and its been very cold here in NY. So It could be from when it was getting dumped with fuel.

What should I DO? Replace them? I really dont want to drop over a Grand to do this. Besides waste and pollution, is there any adverse effects to the engine by bypassing them? I wouldnt think so, since the O2 sensor in before them

Thoughts are appreciated.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

You can purchase aftermarket cats from Timevalve.

www.timevalve.com

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

My mech. told me that the Cat does develop cold spots when it runs rich, like with a chip, I also have a chip (not a 500E tho...) and that probably is whats done it. I didnt replace mine, it just took longer to warm it up in order to pass emmissions, not a probem after that, I got 2 years till smog again.

As for taking the cat out, I just asked a 25 year mech. about that and apparently it doesnt have any adverse effect, except as you said pollution and junk, but it should be a lot louder too.