Foul odor from primary cats

Mar 19, 2014 | 03:13 PM

ChrisD63

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2009 040 Black C63, 2009 Arctic White G55, 2012 Storm Red CLS550 4Matic

Foul odor from primary cats

Has anyone experienced a foul odor from the primary cats? I have had my secondaries and resonator deleted for about 2 years now if that makes a difference. The smell usually occurs a few seconds after i go full throttle. I have 60k miles fyi. The primary cats going bad is all i can think of. On that note, is anyone selling a pair of relatively low mileage (oem) primary cats?

Mar 19, 2014 | 05:44 PM

Merc63

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C63 AMG

I have two sets of cats.

Check if anything is hitting them and burning.

Mar 19, 2014 | 05:56 PM

tfthach13

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From: Sacramento, CA

'09 C63

Is it a burnt smell? If so, that's probably normal; especially after full throttle.

Mar 19, 2014 | 06:15 PM

ChrisD63

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2009 040 Black C63, 2009 Arctic White G55, 2012 Storm Red CLS550 4Matic

Quote:

Originally Posted by Merc63

I have two sets of cats.

Check if anything is hitting them and burning.

How many miles on each? I don't think they are hitting anything.

Mar 19, 2014 | 06:59 PM

Merc63

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C63 AMG

30,000mile

Mar 20, 2014 | 09:57 PM

roadtalontsi

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From: Texas

10 C six trizzle

It's perfectly normal for it to smell like rotten eggs after going full throttle.

Mar 21, 2014 | 03:22 AM

tfthach13

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From: Sacramento, CA

'09 C63

Quote:

Originally Posted by roadtalontsi

It's perfectly normal for it to smell like rotten eggs after going full throttle.

This is the perfect way to describe what I was trying to say.

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Mar 21, 2014 | 02:53 PM

I am Jeff

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From: eNyCe

Steel Grey Metallic C63!!

Quote:

Originally Posted by ChrisD63

I thought it was normal at first as well until it started happening every time and the smell became unbearable.

Like others have already mentioned, it's normal. If you don't want to smell it, don't flog it right before you park it. If you do a cool down run before you park it, you won't be smelling it as strongly.

Mar 21, 2014 | 06:37 PM

#10

ChrisD63

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2009 040 Black C63, 2009 Arctic White G55, 2012 Storm Red CLS550 4Matic

Quote:

Originally Posted by I am Jeff

I should have made my initial post a bit clearer. The smell occurs immediately after I go full throttle while the car is still moving. It literally fills the cabin with an odd odor. It's definitely not a rotten egg smell either.