Can anyone help with Impala 2011 rotten eggsmell?

Asked by Jul 09, 2011 at 10:37 PM about the 2011 Chevrolet Impala LT

Question type: Maintenance & Repair

I have had this car  for 7 months.  It now has 11,000 miles on it. It has had rotten egg smell from day one from exhaust.  They say it is sulfur dioxide and I should change gasoline.  I use Shell and Mobile and no other cars that use that gas exhibits the problem.  They changed the catalytic converter and I still get the smell.  Please, does anyone have an idea of the cause and a possible solution?

10 Answers


find out the engine temp about righ?. ..if ok is the engine getting too much fuel to the intake?

I suppose it is good, the dealer checked everything. The temperature gauge is reading normal. There are no service engine lights on. They just keep telling me it's the fuel.


the roten egg smell is desinetly sulfur....My guess would be to use 91 of a high quality gasoline. ie. shell ,chevron, 76, for at least the next 4 to 5 tank fulls and hopefully the smell will go away once you have completely replaced all the old gasoline wiht the new higher quality stuff. i had to do this to my 07 impala LT because my check engine light would come on after i had driven 55 mph for longer than 1 hour 1/2 straight(3 hour trip to pick up my son.) trying to hyper mile it, got great mileage! It finally worked, but i was using a inferior gasonine. So if they say its the gasonline then that would be my best guess. It worked for me, might work for you

1 of 1 people found this helpful.

try upgrading your fuel to a higher octane i use 94 octane in my 2006 impala ss


the smell can be caused by long idle time.. or keeping your foot glued like lead to the floor.. anyway the smell is from the gas, buy gas some where else, the smell should go away with time and milage

all replys make good since,but best way to answer your question,is this crappy gas we have today,it messes with your cat converter.would be a good idea to have it checked,even with 11,000 miles,it could be clogging up causeing the smell.the ethonol even 10% in the gas as they claim is not good for the fuel system,I would recomend at least every 5th fill up putting in a brand name fuel injector cleaner in it,the gas tank.will keep your fuel system clean.

1 of 1 people found this helpful.

the smell could be your battery going up

2 of 2 people found this helpful.

say what.

1 of 1 people found this helpful.

i have the same problem. 2010 impala. No codes. Tried 5 different fuels.


2014 Chevy Impala 20000 miles on it and I noticed the egg smell in the cabin. It is random that the smell shows up but when it does it takes a min to go away.

1 of 1 people found this helpful.

Your Answer


Looking for a Used Impala in your area?

CarGurus has 27,543 nationwide Impala listings starting at $1,499.


Chevrolet Impala Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Chevrolet Malibu
635 Great Deals out of 48,775 listings starting at $1,500
Used Dodge Charger
256 Great Deals out of 33,484 listings starting at $495
Used Honda Accord
565 Great Deals out of 92,859 listings starting at $1,495
Used Chevrolet Camaro
257 Great Deals out of 30,437 listings starting at $4,200
Used Nissan Maxima
223 Great Deals out of 18,273 listings starting at $1,500
Used Chrysler 300
320 Great Deals out of 19,234 listings starting at $1,999
Used Toyota Camry
853 Great Deals out of 72,897 listings starting at $1,400
Used Nissan Altima
816 Great Deals out of 68,083 listings starting at $750
Used Dodge Challenger
122 Great Deals out of 25,441 listings starting at $7,250
Used Buick LaCrosse
243 Great Deals out of 12,963 listings starting at $1,800
Used Ford Fusion
673 Great Deals out of 59,777 listings starting at $1,991
Used Chevrolet Tahoe
646 Great Deals out of 37,897 listings starting at $695
Used Chevrolet Silverado 1500
2,236 Great Deals out of 151,900 listings starting at $1,499
Used Ford Mustang
294 Great Deals out of 38,678 listings starting at $1,995
Used Ford Taurus
151 Great Deals out of 15,573 listings starting at $1,900

Used Cars For Sale

2018 Chevrolet Impala LT For Sale
4,930 listings starting at $21,420
2017 Chevrolet Impala LT For Sale
69 Great Deals out of 2,642 listings starting at $12,899
2016 Chevrolet Impala LT For Sale
3 Great Deals out of 184 listings starting at $14,279
2015 Chevrolet Impala LT For Sale
4 Great Deals out of 249 listings starting at $11,980
2014 Chevrolet Impala LT For Sale
5 Great Deals out of 280 listings starting at $9,677

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.