Catalytic converter missing honeycomb??? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 11-15-2013, 11:32 AM Thread Starter
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Catalytic converter missing honeycomb???

Hey guys,

I've recently posted about a rattling noise under load. I can't find the source of the noise, but that's another story. My new question... I recently removed my left catalytic converter and noticed the primary cat, near the exhaust manifold, didn't have the honeycomb on the inside. My secondary cat had a clean looking one tho. I thought maybe the first one broke up, but I tipped the exhaust pipe and nothing fell out. Is there even a honeycomb in the primary, or is that cat there to collect exhaust for the O2 sensors. I am very confused, sorry if this is a dumb question. Hopefully the missing honeycomb is the answer to my rattling issue. Thanks for your help.


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post #2 of 7 (permalink) Old 11-15-2013, 01:19 PM
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There should be material in both cats.
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post #3 of 7 (permalink) Old 11-15-2013, 01:48 PM
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Unless you're the original owner, there's no telling what happened to it. But as Noodles noted, there should be material in both of them. Either someone previously dumped it out because it broke up or perhaps it was clogged and they gutted it.

So long as it passes emissions testing, it's nothing to worry about.

Also, since nothing came out when you tipped the pipe, that's unlikely to be the source of your rattle. After all, "nothing" can't rattle.

Good luck.

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post #4 of 7 (permalink) Old 11-15-2013, 02:02 PM Thread Starter
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Thanks for the answers guys. I haven't had to do an inspection yet so we'll see. Do you know what color the honeycomb is supposed to be? My secondary cat's honeycomb is an ash white color.
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post #5 of 7 (permalink) Old 11-15-2013, 11:31 PM
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That color is is correct. It roasts any hydrocarbons at up to 1600º F and that leaves the ash color.
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post #6 of 7 (permalink) Old 11-16-2013, 04:12 PM Thread Starter
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I just had a look under my car an noticed I was missing this bracket. Would that cause a rattle and cause the pipes to flex under load, causing the exhaust leak? Anyone ever have that issue? Did I just answer my own question with a question? 😁
Catalytic converter missing honeycomb???-imageuploadedbyag-free1384647057.384202.jpg


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post #7 of 7 (permalink) Old 11-16-2013, 05:52 PM
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That is a very strong possibility.
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