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i get this rotten egg smell when i start my car when the engine is cold. it's fairly strong in the cabin, but not overpowering and goes away about 2 minutes after the car starts moving.
Does the smell come from outside?
or does it come from your air vent?
If it comes from air vent, its probably a mildew.
if you use your A/C with circulation mode, and turn off the engine with A/C running, it leaves moisture inside the air vent. After while, this becomes a mildew, and creates the strong ordor.
So, it is good idea to keep your air from circulation mode to outside air(?) mode, and good practice to turn off the A/C before turning off the engine (it'll also help if you run the air running full blast with no A/C on for a while to throw out the moisture ouside the pipe).
I know it sounds strange, but this really works.
I've seen many cars (Seen a lot on Honda Accord) with this problem. This can happen on just about any car, but some cars are easier to get these problem then others due to the way air vent pipes are.
Oh, and if the problem is not the air vent, and smell coming from outside (coming out from exhaust pipe), then I would look into all the sensors like cold start sensor, and such.
On my last vehicle when I started having a rotten egg smell it turned out to be a bad cat converter. Just my .02
There is a fine line between fishing and standing on the shore looking like an idiot! The Red Baron: Velocity Red MT, GT Add-ons: Rotary Accents, Strakes, Pearl Satin fuel door; RB cat-back, AC condensor and oil cooler grilles; fog mod, tint, Passport 8500 x50.
Location: Lake in the Hills, IL (NW Chicago Burbs)
It's a combination of a new car with a cat that is working at 100%, and an engine that likes to run rich to keep the cat cool. Throw in some crappy sulfur-rich gas and the problem can get worse. Mine has gotten better over the last 9k miles, probably due to the cat "breaking in" as well as going from the 'K' to the 'L' to the 'M' PCM calibrations.