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Exhaust Sulphur Dioxide (Rotten Egg) smell 

 

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 Post subject: Exhaust Sulphur Dioxide (Rotten Egg) smell
Posted: Thu Oct 16, 2008 9:34 pm 
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I've just had my complete exhaust system replaced with extractors, a 2.5" metal Cat and a 2.5" system with straight through mufflers.

Since then I've been getting the rotten egg smell occasionally appear.
It doesn't do it all the time but is generally noticable when stopped at traffic lights with the window down or again when in a city traffic type environment.
I haven't really noticed anything under acceleration, it seems to be more prevelant under lighter throttle openings and pretty well only noticable with the window down.

Apart from the smell the car runs like a dream with the new exhaust.
Power delivery is now smoother and it has a noticable increase in midrange torque.
Fuel economy was always good but now it's even better.

Given the increase in performance and economy I'm not too fussed about having this smell .... though it would be better not to have it.

Could the smell be a trait of these new "metal" type cats compared to a normal ceramic cat? .... or is my engine some how "out of tune" now with this new exhaust?

Any thoughts .... should I be concerned that something is not right?

 

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Posted: Thu Oct 16, 2008 9:37 pm 
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Give the exhaust time to carbon up. New cars do this too.

It's normal, it'll go away.

 

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Posted: Thu Oct 16, 2008 9:50 pm 
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It could also be the glue stuff they use on it - forget what its called and what it was exactly but mine had it for about a week, now its gone
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Posted: Thu Oct 16, 2008 10:12 pm 
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dude is your car on lpg?

rotten egg gas smell SHOULD not come from a petrol car
regardless if the exhaust has been replaced or changed

 

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Posted: Thu Oct 16, 2008 10:49 pm 
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data_mine wrote:
Give the exhaust time to carbon up. New cars do this too.

It's normal, it'll go away.

Ah .... good to know .... thanks Chris :wink:

 

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Posted: Thu Oct 16, 2008 10:53 pm 
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Also, might want to check for any leakages just in case one of the gaskets wasn't put on properly.

phong =P~

 

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Posted: Thu Oct 16, 2008 11:08 pm 
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Disco Frank wrote:
dude is your car on lpg?
rotten egg gas smell SHOULD not come from a petrol car
regardless if the exhaust has been replaced or changed

Unleaded cars can produce sulphur dioxide under certain circumstances which is why I asked the question.


phongus wrote:
Also, might want to check for any leakages just in case one of the gaskets wasn't put on properly.
phong =P~

Good point .... I'll crawl under the car and check the cat flanges for leaks on the weekend.

 

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Posted: Thu Oct 16, 2008 11:15 pm 
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just leave the engine running and have a sniff around, you will find it soon enough.. kidding, just a new system smell it'll fade as data_mine suggested.

 

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Posted: Thu Oct 16, 2008 11:48 pm 
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never heard of an unleaded car producing this gas

 

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Posted: Fri Oct 17, 2008 12:20 am 
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BP wrote:
WHAT IS THAT HORRIBLE SMELL?
Although Unleaded has less sulphur than Leaded Petrol, the sulphur sometimes accumulates in the catalyst and is then burnt off under rich conditions. This results in a release of hydrogen sulphide (rotten egg gas) and that distinctive smell. Although unpleasant, it is not dangerous at these levels and tends to occur when the car is new.

http://www.bp.com/liveassets/bp_interne ... leaded.pdf

Nothing to worry about, you've got new cats.

 

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Posted: Fri Oct 17, 2008 12:58 am 
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Thanks Chris ... so a bit of smell is normal and we can blame the new cat .... I can live with that :)

I just wonder if chosing a metal cat over a ceramic one would have any thing to do with it as well?

 

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Posted: Fri Oct 17, 2008 1:10 am 
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It means your cat is working perfectly. if its a leak around the flange, you should be able to hear it.

 

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Posted: Fri Oct 17, 2008 6:06 pm 
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Does it make a hissing sound when you've got an exhaust leak?

The exhaust on my old EA made a faint hissing that sounded like it was coming from the cat. That exhaust was fitted professionally. The AU, we put the exhaust on and that noise is still there, but it sounds a tiny bit louder. I usually hear it while accelerating up a hill. Sound like a leak to you guys?

 

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Posted: Sat Oct 18, 2008 5:01 pm 
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Start the car from cold and run your hand over the exhaust joints before it gets too hot and see if it leaks.
You will feel the gas on your hand if it leaks

 

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Posted: Sun Oct 19, 2008 8:19 am 
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Disco Frank wrote:
never heard of an unleaded car producing this gas


:D Yeah they can Frank!
Our EA had the cat s**t it's self & it stank of rotten egg gas!

 

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