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 3 of 3, other pages: 1 2 [3]
2014-07-13, 14:14:16
payday loans  
pmbqbvz payday loans PFxPAp payday loans %-[[[ payday loans 0823 payday loans 8419
2014-08-09, 02:20:56
sameday payday loans online  
gbedcyk sameday payday loans online >:]] spot loan >:-[ payday loans %-[[[ sameday loan 8]]] money mutual >:-[
2014-08-17, 07:03:15
next day loans  
gyuexk next day loans :-O payday loans %-[[[ payday loans 9867 money mutual 0257 payday loans 3195
2014-08-21, 17:16:52
viagra online  
2017-06-27, 04:18:09
Janeen from Taipei, Taiwan  
I see your website needs some fresh posts. Writing manually takes a
lot of time, but there is tool for this boring task, search in google:
murgrabia's tools
2017-07-08, 15:27:34
Dallas from Jundiaí, Brazil  
I must say you have very interesting content here. Your posts can go viral.
You need initial boost only. How to get massive traffic?
Search for: Murgrabia's tools go viral
2017-11-19, 16:20:16
Lyndon from Bandung, Indonesia  
I have checked your website and i've found some duplicate content,
that's why you don't rank high in google, but there is a tool that
can help you to create 100% unique content, search for; Boorfe's tips unlimited content
2018-11-19, 05:57:43
anonymous from United States  
You are on page 3 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: