2010 SS Smelling Up My Garage

[nicogb13]

Hey all, brand new to the forum! I just bought a 2010 SS with 82k miles and drove it back here to the Denver area from San Diego. It is bone stock as far as I can tell. I just parked it in the garage for the first time and came back a few hours later and the garage absolutely reeked of gas/slight rotten egg smell. Most posts I see on here people recommend altering a mod or getting a tune, but I shouldn’t need to tune a stock car right?? I passed smog two days ago, so the cats are at least doing something.

Could really use some help, wife is gonna kick me out of the garage because the smell is coming into the laundry room…

[gtstorey]

This sounds more like a fuel leak than a tune issue.

[nicogb13]

Is it crazy to think I have a bad gas cap? I just spent 20 minutes with the car on and a flashlight looking around at everything. I looked for drips on the undercarriage, around the gas tank, around each injector - nothing. I stuck my nose in the exhaust, no smell at all. The only time I smelled anything was when walking by the gas door and opening the gas door. When I bought the car the gas door was significantly more faded than the rest of the car. Could be a smoking gun? Will update when my replacement cap comes in.

[gtstorey]

I think I remember some problems with leaks on top of the tank at the fuel pump

[MSgt O]

the rotten egg thing is stumping me...sulphur? The fuel smell could be venting fuel out a bad cap, theyre cheap to change. Depending on what color your car is, the fuel door is a little off color wise on certain cars due to it being plastic and the rest not. My white fuel door is not the same white as the car.

[larry_g]

I've heard in the past that a sulphur smell is common when a cat goes bad. Interesting that you just passed a smog check.



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[J35Y2]

Originally Posted by larry_g

I've heard in the past that a sulphur smell is common when a cat goes bad. Interesting that you just passed a smog check.



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This. I have a 2nd cat delete on my stock downpipes, with the factory shorty headers, and it definitely still smells when the primary cats are warmed up/hot. I'm sure if you have high flow catted down pipes with shorty headers, they use 200 cell metallic core cats, which will smell more, but should lose the sulfuric smell and have more combined burnt and raw fuel, more traditional exhaust fume smells.

Cold starts will obviously smell like raw fuel a bit, no matter what, which is normal; but the hot cats will somewhat smell kinda like a sulfuric, eggy smell when you get up close to the tail pipes.