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Old 04-23-2001, 07:29 PM   #1
Aaron'z 2.5RS
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Location: Hickigan
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'00 RS/WRX Stg5
'98 RS Stock

Post Questions on the nasty EGG smell

Hello,

I have a question reguarding the nasty egg smell comming from my car al the time.

1st....I increased the size of my exhaust pipe to 2.25"(cat-back).....and added a high flow muff.

Could the decrease in backpressure cause the cat to NOT be working properly giving me the egg smell....???

I have to do something about the smell.


Thanks,
AaRoN
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Old 04-23-2001, 07:32 PM   #2
JoeT
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Location: Toronto, Ontario, Canada
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2000 Turbo Legacy GT
Titanium

Post

The rotten egg smell is caused by the "Sulphur" in the fuel, try another brand of fuel and see what happens after a couple of tanks.

Hope this helps.
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Old 04-23-2001, 07:36 PM   #3
bsquare
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Silverthorn Metallic

Post

Also, your car is likely to be running lean unless you added a fuel computer to compensate.
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Old 04-23-2001, 07:51 PM   #4
steppin16
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Post

i had that problem but i was running rich and it had to do with my intake
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Old 04-23-2001, 07:57 PM   #5
Blindeye_03
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Location: Woodstock, Georgia
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2004 TSX
Blue

Post

i usually smell that cuz of the clutch burning ..which isnt good
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Old 04-24-2001, 06:59 AM   #6
25psi
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Silver

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Rotten Egg smell is very often indication of catalitic converter going bad.

Eugene
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Old 04-24-2001, 01:36 PM   #7
tonytiger
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White

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I think the cat isn't working as it should. Here where I live it's usual to have that smell when starting at winter time (even -20 celsius). When the cat is cold it doesn't work properly and that makes the sulphur with the its lovely smell come through the pipe. I had the problem couple of months ago, but it vanished. I'd (very unprofessionally) would say there is something wrong with the new setup. In cold air the pressure is smaller than in warm and it might be compared with the decreased backpressure. Don't know but could reseting ECU help. Really just a gues My oppinion...
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Old 04-24-2001, 01:40 PM   #8
bratmantlz
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white

Post

so what would be the fix for this smell prob? what are some signs besides the smell?
Brian
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Old 04-24-2001, 03:55 PM   #9
sck
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Hello,

I've been lurking around this forum for a while and never posted. But today I found out something very interesting that I had to share...

I have had the rotten egg smell since I bought my car last June and the dealer has never been able to find a problem. Just recently my CEL came on and turns out have a bad front O2 sensor(being replaced tomorrow). Today, I had the opportunity to talk to 3 independent mechanics at my friend's garage and I asked them what could cause a rotten egg smell. They all said, almost simultaneously, "The battery's over-charging" What?! They said most often that is the problem...the voltage regulator doesn't kick in. Check that, or the alternator. Not a bad O2 sensor, catalytic converter going, bad gas? They said not usually.

I'm not saying that is the definitive answer, but does it not sound plausible that the sulphuric acid in the battery could break down into sulpher dioxide under a heavy electrical current? Maybe I'll crack open some old textbooks and take a look.

This might be something to look into.


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Old 04-24-2001, 06:31 PM   #10
Bonzo
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Post

here's my .02 worth. I don't believe it's the batteries over charging. Drive an electrical fork lift truck and you will smell batteries.

I beleive the rotten egg smell which I have also on my 2001 is from an overly rich fuel mixture. When I drive the car slow as in he city w/o much throttle the smell is non-existent. When I get into it hard with some full throtle use I can even smell it coming in through the sun roof. At wot the injection system is running rich, and the smell is the catlysts working but not quite up to optimal temps. A rich fuel mixture will produce lower egt's (exhaust gas temps) and thus lower catylist temps. Catylists need heat, the more the beter to burn off the bad stuff.
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Old 04-24-2001, 06:39 PM   #11
Xio
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2011 Outback ABP

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Bonzo-- I am experiencing the exact same problem. What can be done about it?
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Old 04-24-2001, 06:51 PM   #12
steppin16
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Post

my car was running rich as stated above because of my aftermarket air filter... today i got it back from the shop and punched it with no smell at all... so i would suggest something to keep the fuel mixtures correct... i think a ecu would do it right?
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Old 04-24-2001, 07:42 PM   #13
sck
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Post

I only bring up the battery idea because I thought it was interesting and it was mechanics telling me this.

I don't seem to have a pattern to when my car smells and I don't drive hard at all because I've been getting what I believe to be horrible gas mileage(18 mpg, every tank counted, gas is 80 cents a litre here, ?/gallon). That is what my dad gets with his 214hp V6 1994 Eagle Vision TSI(this might get me in trouble, but I love that car)

Hopefully, my new O2 sensor should fix my problem. If it doesn't, I'm going to follow up on this battery idea, and any others.

The bottom line is we shouldn't have to put up with the smell. In 15 years of driving, I have smelled sulphur from a car I was driving maybe a half-dozen times - not several times a day like I do from my Impreza. No one I know with Legacys or Outbacks is having the kind of problem I am having.

I love my Impreza, just not the way it smells.

Stephen.
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Old 04-24-2001, 08:53 PM   #14
Bonzo
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Post

It sounds like a fuel mixture problem. I am not a scooby specialist but from what i gather and ahve experienced the fi system in this car is not the most consistent compared to other cars I have owned and it is somewhat quirky. Maybe an ecu reset might help. I have zero mods, never did a reset and am getting 23 to 29mpg. I did read somewhere that after an ecu reset you get bad mileage until the puter re-adjusts. I will be installing my own cai in a week or so and will try to run w/o a reset and then try a reset and see what happens.

Good luck hope the 02 sensor helps. What year scooby? 00?
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Old 04-24-2001, 10:49 PM   #15
Aaron'z 2.5RS
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Post

Well people,

I'm not new to resetting my ECU, i've been doing resets now for a year (sometimes 3-4 times a month!!!)

But my set-up looks like this
MY99
K&N panel w/snorkus removed
2.25" pipe from the cat back with a Borla on the end, the muff has 2--3" tips

This is why i am conserned that the back-pressure may be low and keeping the cat to cool to work properly.

My train of thought is maybe if i were to replace my 2.25" pipe with a 2" pipe i might increase back-pressure just enough to fix the problem AND maybe get back a small amount of my low end power.
I know.....i know....it's a long shot....Opinions....

AaRoN
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Old 04-25-2001, 12:36 AM   #16
gavin
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Post

Not necessarily going bad, but definitely not working as it should.

Do you have headers, too, or just a catback? Maintaining EGT is very important for a properly functioning cat. I suppose that just adding a larger cat back could be slowing the exhaust enough to cool it inappropriately, but I wouldn't think so. A quick test would be to temporarily wrap your exhaust and see if the problem goes away.
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Old 04-25-2001, 12:58 AM   #17
paultg
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Question

Not to be on a completely different side here, but do you have the Subaru Air Filtration System under the dash?

I think my manual says something about a horrid smell when the filter needs to be replaced. It is supossed to be done every 12 months. I am working on month 23 of the original filter w/o a problem, but I have a new one ready to go.

Just another idea, I was not sure if your smell was inside or outside the car.

Paul G.
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Old 04-25-2001, 05:31 AM   #18
bratmantlz
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Post

so if its a bad cat or fuel shouldnt it smell all teh time.??
Brian
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Old 04-25-2001, 09:13 AM   #19
gavin
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Post

Once again, wrap your exhaust, temporarily, which will keep your EGT high, and see if it goes away.
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