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Bad exhaust fumes after catalytic converter removed

Old Mar 19, 2012 | 04:32 AM
  #1  
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2001 w203 C180
Bad exhaust fumes after catalytic converter removed

Hi Guys

So sometime ago i removed the catalytic converter from my car. I had it replaced with a silencer/muffler. Now, if i drive with the windows open i get a lot of exhaust fumes coming into the car. (never had this problem before i removed the cat). The fumes/smell is quiet bad! my eyes actually burn with the fumes.

I took it to the exhaust people, there are no leaks etc. in the exhaust system.

I don't know what to do?

Any suggestions?

PS. I drive a 2001 C180 non kompressor. The mileage is 301000kms
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Old Mar 19, 2012 | 04:45 AM
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That's normal since you removed the cats! The cats are what reduce the exhaust/gasoline smell.

Nothing is wrong. If you want to reduce the fumes, then you have to put cats back on.
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Old Mar 19, 2012 | 05:10 AM
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2001 w203 C180
Originally Posted by nlpamg
That's normal since you removed the cats! The cats are what reduce the exhaust/gasoline smell.

Nothing is wrong. If you want to reduce the fumes, then you have to put cats back on.
Oh snap!!
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Old Mar 19, 2012 | 05:14 AM
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I get no fumes in the cab from a pre cat car. Something else must be wrong. There are a lot of cars on the road without cats & they do not have this problem.

Place a rag over your exhaust with the car running to hear whether there are any leaks.

Try extending the tail pipe a little to clear the rear bumper . Mine is adjustable.
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Old Mar 19, 2012 | 06:54 AM
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Thanks Carsy... i did go to an exhaust specialist and no leaks were found.

Will go to someone different to get a second opinion
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Old Mar 19, 2012 | 05:55 PM
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LOL! Well, guess you're not in the US.
So, what engine do you have, if not a Kompressor?
Curious since we didn't get that version here.
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Old Mar 19, 2012 | 06:44 PM
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What did you do with the O2 sensors when you cut out the Cats?
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Old Mar 19, 2012 | 06:47 PM
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Originally Posted by C230 Sport Coup
LOL! Well, guess you're not in the US.
So, what engine do you have, if not a Kompressor?
Curious since we didn't get that version here.
C180 & C200 were available naturally aspirated prior to Kompressor in ROW.
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Old Mar 20, 2012 | 01:53 AM
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2001 w203 C180
Originally Posted by Glyn M Ruck
What did you do with the O2 sensors when you cut out the Cats?
Hey Glyn

The O2 sensor is still there, they just installed a 'cat block', or at least i think that is what they call it.
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Old Mar 20, 2012 | 01:55 AM
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2001 w203 C180
Originally Posted by C230 Sport Coup
LOL! Well, guess you're not in the US.
So, what engine do you have, if not a Kompressor?
Curious since we didn't get that version here.
Hey C230...

Nope, im not in the US. I reside in South Africa.

I have the w203 C180 (M111 engine).
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Old Mar 20, 2012 | 03:48 AM
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What is the displacement?
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Old Mar 20, 2012 | 04:09 AM
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2001 w203 C180
I think its a 1799 cc (1.8 L) it produces 95kW (129hp).

The w203 (like mine) has the M111.921 engine whereas the w202 has the M111.920 engine
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Old Mar 20, 2012 | 09:17 AM
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Originally Posted by selwyng
Hey Glyn

The O2 sensor is still there, they just installed a 'cat block', or at least i think that is what they call it.
Are you storing any fuel trim codes?
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Old Mar 20, 2012 | 09:23 AM
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2001 w203 C180
Originally Posted by Glyn M Ruck
Are you storing any fuel trim codes?
No nothing at all.
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