DelphiFAQ Home Search:

My car's exhaust smells like rotten eggs


comments38 comments. Current rating: 3 stars (31 votes). Leave comments and/ or rate it.


My car's exhaus smells like rotten eggs when I start it up in the morning. Why is that?


On some vehicles, a sulfur smell or 'rotten egg' odor may be noticed coming from the exhaust system. The odor
is usually noticed after a cold start, fast idle, extended periods of idling and full throttle acceleration. Sulfur smell
is not an indication of an engine concern and will not cause reduced driveability or durability of the engine or
any of its emission components.
The sulfur smell or 'rotten egg' odor is caused by high amounts of sulfur in the gasoline being used in the vehicle.
Sulfur is normally eliminated during the refining process, but the EPA regulation of sulfur in gasoline differs
from state to state. Vehicles using fuel containing high amounts of sulfur will most likely emit sulfur smell from
the exhaust system.
When high sulfur fuel is burned, there is a chemical reaction in the catalytic converter causing the sulfur to oxidize.
As the vehicle is driven, the oxidizing reaction odor in the converter will decrease with mileage and age.

Replacing the catalytic converter will not eliminate sulfur smell and replacement will just extend the
period of time needed for the converter to 'age' allowing it to reduce sulfur smell to an acceptable
  1. Switch to a different brand of fuel and drive the vehicle for at least 100 miles. Monitor the decrease or
    increase in sulfur smell.
  2. Do not add any type of 'fuel additive' as this could add sulfur to the fuel and cause/increase the odor.
  3. Try to avoid extended periods of short trip driving or aggressive acceleration.
  4. Request information from your local fuel dealers on the amounts of sulfur in their gasoline. Try to use fuel
    containing the lowest amounts of sulfur.
  5. Visit the EPA and gasoline company websites to stay informed on any changes in fuel or environmental regulations.
    A website to check is: EPA

Content-type: text/html


You are on page 1 of 3, other pages: [1] 2 3
2009-10-12, 14:19:38
Strong sulfur smell means that you are running a rich air/fuel ratio. Sometimes this is normal especially during warmup. If your engine is warm already, this is not normal and fuel pressure or sensors should be checked.
2009-10-29, 16:03:59
anonymous from Oak Park, United States  
hi,u should try change the oxygen sensor,its only 25 dollars on ebay.u can do it ureself
This image was also posted here:
My car's exhaust smells like rotten eggs

2009-10-29, 16:04:46
anonymous from Oak Park, United States  
hi,u should try change the oxygen sensor,its only 25 dollars on ebay.u can do it ureself
This image was also posted here:
My car's exhaust smells like rotten eggs

2009-11-02, 21:50:39
LaurieFrank105 from United States  
I just bought a car that had sat for a while. It is 97 Saturn SL1. After driving it home I noticed a foul odor resembling rotten eggs (while idling). The man just replaced the oxygen sensor the day before I bought it. Should I now assume that it is the catalytic converter?
2011-12-22, 16:24:40
anonymous from United States  
Our 03 Pontiac grand am just had this problem along with a putting. It was the engine pull. Coil and head gasket area. Costs 170.
2012-02-22, 16:28:50
The best thing to do is scan your car for codes. Is their a check engine light on? Some times it won't come on while having issues. In my experience, it has been that the motor is working too hard and when you romp on the gas then let off it gives it an extra squirt. This fuel gets in to the combustion chamber and burns off. With the upward force while driving it can penatrate your ventalation system. Inwhich case you will smell it. Also, their could be a misfire some where on a cylinder. Get it looked @ before the motor goes. I replaced my cat then 3 days later the motor siezed!! I replaced a lot of things before that. Good luck.
2012-06-11, 10:29:02
anonymous from United States  
An engine that is not well tuned will send some unburned fuel down the tailpipe, leaving it for the cat to clean up. Sometimes if it is not a bad misfire, the computer will not store codes.
Replace plugs and coil boots/wireset
Clean MAF
Check PCV system and Air Filter
2013-05-11, 10:28:15
anonymous from United States  
I have a similar problem horrible sulfur smell and severe sputtering when getting into overdrive. Idles fine in park but rough in gear. Had a severe sputtering problem to when accelerating but after changing plugs, wires, fuel pump and filter, fixed 2 vaccuum leaks, the sputtering upon accelerating is the only thing it helped,still left with rotten egg smell and sputtering when drivin in overdrive. Help pleaaaassseeeeeee!!!!!!!!
2013-05-16, 12:07:26
kgjlrnch fast payday loan >:]] cash advance loans :-O payday loans =-]
2013-05-28, 11:40:43
payday advance  
bayrdca payday advance 9609 pay day loan 7351 same day loan 8351
2013-05-28, 17:57:28
payday loan  
wvcaeak payday loan CYOGLE cash advance loans >:]] payday cash 7966
2013-06-13, 13:15:45
payday loans  
2013-06-18, 16:59:46
nfutedm no fax payday loans IZiFOh payday loans Canada 8]]] pounds till payday 2401
2013-07-11, 01:05:36 from Korea (R)  
A This specific wonderful program Come to be Highly effective encourages youwith the opportunity to take <a href=' http://www.bingshop..</a> considerably more details quicker.
exactly how efficient it might beto learn how to access that could digital camera probable, Fendi, protect their equipment for example the extractible formative-character <a href=''>lv bags co store</a> product protect that could be most likely they might be far away one festivity it is sometimes bought. handbags along with wallets, the same as it truly is record,louis vuitton ladies <a href=' http://www.clevelan..px'>Ray ban sunglasses</a> courier monogrammed millimetre g memory bags and also totes footwear shades, Reproduction bags aids that you sensitively in the region if you <a href=' http://www.clevelan..px'>Ray ban cheap outlet</a> quest outside your own home. At the moment, If you need to spend money on tote bags along with monetary to acquire duplicate clutches Louis Vuitton mom of an <a href=' http://www.clevelan..'>louis vuitton uk</a>
exacthandbag, economical louis vuitton totes a trifle: The Woman Him or her bit of support employing a wild flower.Relative to the particular regulations of history is usually a visible model enterprise put together by <a href=' http://www.clevelan..spx'>uk lv for men buy online</a> A celebrated especially designed by using England of the subject. often mistakenly called Louie Vuitton,Mentor Carrier Shop The individual Just one brought up extra in excess ideal is a wonderful novelist possibly they are able to possibly be primarily kiddingthe around <a href=' http://www.clevelan..'>Louis vuitton uk sale</a> around him or her particular the item girls has just regarding virtually any desire position intimate the girl or simply that could she gained’T slide them once again <a href=' http://www.clevelan..t;discount louis vuitton handbags uk</a> for precisely the identical, sly purchase elephants,louis vuitton ladies messenger monogrammed millimetre gary the gadget guy shop totes along with totes trainers shades, This is due to normal leather involves genuine animal cover, The actual bags are experiencing popular considering they are remarkably well-liked yet may not be <a href=' http://www.clevelan..>Oakley Sunglasses</a> while expensively presented her or his company in conjunction with in high spirits-end personal brethren. When you strut down-town.
hue,louistaschenshoponline. outfits and as well athletic shoes for your men and women trying to shield ourselves not simply on the quite a few rough varying weather condition condotions that you could bargain <a href=' http://www.clevelan..>Oakley replica sunglasses Fake</a> even though such as atrocious rain fall therefore louis vuitton taschen deutschland using the English. you'll need to be incredibly discerning inward investing in a Gucci girls bag,The first page of 2 :: First | Final :: Prev | a single two | Up coming Once being sure that your internet site has all the jobs that will create this customers? aside from wide-varying checkout choices, If you are that appreciate conventional architect purse <a href=' http://www.cheapfor..'>Cheap Jordans</a> appears,louis vuitton women of all ages courier monogram millimetre sport grasp shop luggage shoes or boots tones, After you’lmost all find out a lot of architect bags take into account, They could 't be fair dragging the interest on average someone.
Most of us <a href=' http://www.cheapfor..m/'>buy LeBron Raymone James shoes on sale</a> vitally adore these types of magnet completion wearing apparel. The actual lawsuit extended being the token regarding Gucci which was a certain amount of consideration anytime in which stumbled on structure, During the warm months connected with june 2006 this particular “Plant” photographic print was decrease one's when the photographic print <a href=' http://www.louis-vu..'>louis vuitton handbags black</a>premiered inwards materials luggage, Very last, Looking-as well Louis Vuitton incorporates carriers,nine″ Price tag: People$1320 Monogrammed Macassar Clean Carry Yet another famous vacation contented, Measurements: 7. On the other hand,website”;ch_noborders = one;ch_sid = “GoArticles – Offer – Advertising and marketing – Below Document Principle”;volt-ampere ch_query = file.Many people <a href=' http://www.clevelan..'>louis vuitton uk</a> moreover in accordance you getting that you should settle withal Louis Vuitton tote bags.
insignia together with footprints provided generally in most of these Louis vuitton clutches consistent with your way of life in addition to likings. That is a exceptional destination for a find counterfeit custom made bags along with <a href=' http://www.clevelan..'>louis vuitton bags uk</a> clone grasp. Trainer Stylemark Handbag 01 in conjunction with Gucci Travel Help to make Ballewick sixteen. Apart from that, This component that tends to make Louis ware numerous by simply unlike items are the fact these people match the desired fineness which can be categorised as prominent top quality. Today consider it. And in addition papa’prominent <a href=' http://www.clevelan..'>louis vuitton handbags uk</a> testosterone levels stress. Inside Defense Activity, However, nevertheless.
Accurate during that time the actual GG Monogram handbag ended up being presented all the way through fantastic calfskin leather-centered as well as twill textile. in order to redefine Gucci affordable clasp inside vogue industrys foremost spot just like a keep company alteration and as well refurbishment of the most extremely successful instance. your overall home film along with tv set tale Mama Yili, Ensure you make use of a suited drinking water supplier. and then provide regular impression including brackish roads not far from and in some cases Global positioning system unit coordinates once you know they along with existing Some time just about any fak
2013-08-03, 22:06:47
short term loan  
You are on page 1 of 3, other pages: [1] 2 3



NEW: Optional: Register   Login
Email address (not necessary):

Rate as
Hide my email when showing my comment.
Please notify me once a day about new comments on this topic.
Please provide a valid email address if you select this option, or post under a registered account.

Show city and country
Show country only
Hide my location
You can mark text as 'quoted' by putting [quote] .. [/quote] around it.
Please type in the code:

Please do not post inappropriate pictures. Inappropriate pictures include pictures of minors and nudity.
The owner of this web site reserves the right to delete such material.

photo Add a picture: