Everytime i take the car to 90 or more i have a scent comming from either the engine or the transmition, i want to know if this is normal or a problem, i have on 03 sedan auto with only 53k miles.

 

be more specific about the scent. a burning scent? dog poo scent?

 

its more of a burning or friction scent, nothing too intense but you notive it everytime that i take it past 90

 

Hot oil (engine or gear) type smell?

 

i wouldnt say oil but definatly lean towards the gear scent

 

Is it something like sulfur? I usually get that smell when I floor it harder than usual, my guess is that it might be from imcomplete combustion due to rich air-fuel mixture. The dealership told me it's caused by the aftermarket intake (AEM CAI), but I wasn't 100% convinced. I had a Maxima completely stock and it was doing the same thing. Maybe it's just Nissan?

 

Nope, my acura tl has that smell when i floor the car harder then usual. Its b/c of the gas.

 

from google:


is usually caused by fuel mixture in the engine that is too rich.

The rotten egg smell of the exhaust is fuel related. It is usually from sulphur compounds in the fuel. The catalytic convertor converts these compounds, therefore this odor is a sign that the convertor is working. One compound found in the exhaust may be sulphuric acid. This varies greatly from supplier to supplier and has nothing to do with the octane rating of the fuel. Changing brands may or may not reduce the odor, but is worth a try. I prefer using fuels that are low in sulphur content.
The reason that changing brands may not fix the problem is that several local filling stations may all be getting their fuel from the same tanks at the distrubition center with the only differences being blends and additives.



THE CULPRIT: Hydrogen sulfide in the exhaust, which is produced by trace amounts of sulfur in gasoline. It's supposed to be converted to sulfur dioxide in your catalytic converter. This may be indicative of a fuel-injection problem, and can be cured by a sharp mechanic. But often it means a failed catalytic converter. The bad news: A new cat is expensive. The good news is it's probably covered under warranty. Check with your dealer.

more smells:
http://lifestyle.msn.com/your-look/w...mentid=8416365

 

Great research. Looks like I got half right.... lol

Then how does the smell get back in the cabin, if it comes out of the exhaust when you floor it? Is it the tail airflow actually bringing it in? I know it's normal to get that smell from a car that floors by, but when I floor it, the smell seems to get in from the engine bay.

 

I think it’s because you get so excited when you reach 90mph, you fart and don’t realize it