e420benz

I have a 1997 e420 and I think my cats. are bad because i can here the popcorn popping underneath the car . So i'm going to make no attempt of going to the dealer. I was wondering how many cats. are on each side of the car and which one usually goes bad? Can i run a straight pipe? Can I just use universal cats. from magnaflows and how many i need if so what part number do i need?

e420benz

Please some body tell me something tell me what you guys did, when it's of warranty.

Z06EATER

hmmmm well what tends to make that "popcorn" noise is the tile like pieces tht are stuck into the cats under there, u can try to go under there urself, and see what's up, maybe it's a little DIY. mine was.

good luck bro. if nothing seems like u can fix, then it looks like u may need new cats.

gujupimpster89@

hey well my cats arent bad, but im planning on buying these cats http://www.speedyperformanceparts.co...5&brandid=1838
and i think u'll need 2 one for each side.

E320Star

is your check engine light on?

e420benz

no not a C.E.L. just the noise coming from the exhaust

s.f.clk02

well i have a 02 clk, and my car was making this noise also like a can was stuck underneath my car. and i took it into the dealership and found out that my exhaust pipe was bad so i was quoted 700 cause my warrenty had ended. but my freind hooked it up for the free. other freind quoted me 120.

C-2

I had the popcorn sound too.
However, it only happened while in gear, more intense at idle and disappeared when driving.

---

Like sflcko2, it was not the cats but a broken weld on the pipes. Couldn't see the break unless pressure was put between the pipes. My neighbor and I welded it for free and all is fine now. BUT I wonder how many people they stick with new cats?

----

Figure out when and where your sound is coming from.

s.f.clk02

it would happen to me when i was in park, or after revving my engine and in drive at like a stop light or something.

e420benz

I'm about to order my cats. I know which one is bad but since i'm getting it done do i need to replace all of them if so how many do i need. Do you replace the pre cats also. Please let me know how many i need. Really plan on doing it this weekend.

These are the ones i'm looking at: http://www.overnightautoparts.com/pe...5&brandid=2175

ReZzZ320

to my best of knowledge all you really need is two

zx11blade

Don't panic, it is usually the driver's side rear cat that is causing the problem. I had one installed for $220 from Lou's Custom exhaust in North Reading, Mass.

fast_car

my E320 has the same noise came from the cat and for a few month, both of them clog and car won't be able to accellerate any more

2 cat needed

e420benz

Can I bypass my Catalytic Converter here in mississippi we don't have all those smog and emission laws. So if i was to cut it out and bypass it will it hurt anything my o2 sensor are before the cats so will it throw a c.e.l. Please be honest and tell me what it would do thanks alot.

clkal

my CLK55 has 4 cats and a 2.5 foot long resonator. The 02 sensors are inbetween the first set of cats and second, so I had the rear cats PLUS the resonator cut out and replaced with 3.5" piping.

the car sounds MEAN! no C.E.L. either.

e420benz

Just got back from the shop. I just cut the cats. off and ran a straight pipe. they did a great job, to me i'm fine with it no c.e.l Great!

sosh

OK you are now illegal and to a feseral offense. When, and not if you are caught the fine will be more than many sets of Cats and eventually the sensors will turn on the CEL and bet no reputable shop will work on the car.

e420benz

Thanks for your comments, but guess what whenever something happens guess who has to pay for it. And beside there won't be a problem about working on when you do everthing yourself! Besides talked to a guy that is MB tech and he told me that it wouldn't be a problem since i'm in a state that doesn't enforce emission laws and i wouldn't get a c.e.l light either.thanks anyway!

sosh

First off those laws are Federal, not state. Second, if you keep removing failed parts and cobbling up the job in a little time you won't have a car left. The fact that you did this yourself and do all the repairs yourself, most likely in this manner does not speak very highly for your abilities or your thought process. I doubt very much if someone from MB suggested you do that. Missippi is still in the US isn't it??

e420benz

What you fail to realize is that who car is it anyway,
The fact that you did this yourself and do all the repairs yourself, most likely in this manner does not speak very highly for your abilities or your thought process. what are you saying? Why would you take a car to dealership when you can do it yourself just say you want do it, speak for yourself this is my car I care for it the way I want. Again this is not your car, I cut them off now that the end of it. You don't know what was told to me by a MB tech. So I think he would know better than you! Keep taking your car to the stealership and leave me alone.

lkchris

Good luck ever selling YOUR car.

If you do it will be an illegal transaction.

Penny wise, pound foolish.

If you can't afford to maintain a car, you can't afford to own it.

lkchris

Good luck ever selling YOUR car.

If you do it will be an illegal transaction.

Penny wise, pound foolish.

If you can't afford to maintain a car, you can't afford to own it.

Perhaps you should own a 1957 DeSoto and stop "showing off" that you're a Mercedes owner.

sosh

Agreed!! But then again this guy asks for help, then brags about doing something thats against Federal Law, and *****es that someone calls him on it!! For all we know he does not even drive this car and might well be living in it!! Some one should report him to the feds and he will learn that Mississippi is still within the US. He may not realize this!!

KADE

I had my cats done last week it was for free by Mercedes= for 8yrs or 80miles. Hopefully you have under 80k and you can have the dealer to do it for free!