We all know the rx7 isn't the cleanist engine on the market as far a emmissions go. I had mine for about three years now and have had all kinds of different things done to it. At its present state, this is the way its been since about feburary 2001. Since about a month ago, if I have the engine running and get something out of the trunk, I carry a stench of exhuast fums with me for about thrity minutes. The car does not run any different that I can tell since feburary. Thats why I ask if you car stinks, and if not what could make it stink. There is not smoke comming out the back either. Any feed back would be cool. I was thinking the o2 sensor since it hasn't been replace in about 50,000 miles

 

Mine kinda has a fishy smell from the exhaust. I am running with 3" piping all the way with a tiny hi flow cat. Pretty strong smell when I crank it too.

 

it's your cats. There is something wrong cause they are not burning all of gasses it needs to burn.

 

Your O2 sensor is prob not the reason for the smelly but it needs replacing anyway - BOSCH recomends replacement at 25k mile intervals

Your lack of an air pump means your cat is probablly clogged and non functional Cats NEED the extra air from the airpump to function properly

 

I have no cats, just a high flow muffler in its place for about 2 years now, it always didnt smell like this.

 

well then I can only say its not running right. I know when my friends MAF sensor went bad on his Supra it started smellling bad [like rotten eggs/ sulferic Acid smell] Once he replaced the MAF sensor it was fine again...... All I can say is cheack everything.........

 

with no cats you expect it to smell good???

i ran with no cats, love the smell of un burnt rotary exhaust..yes rotaries smell diff then piston engine, we have the slight oily smell in it, this with all the extra hydrocarbons(the stuff that makes your eyes water and burn) is part of a rotary..
when i would be arround my car with it running, or after i pulled it in the garrage, i would smell similar to after i had mowed the lawn, but not with a grassy smell just the gas/2 cycle oil smell

invest in febreez, and carry a extra shirt with u @ all times..and a bottle of your fav colonge in the glove box always gets u outa a jamb

 

On mine running a 3" DP, 3"MP comes out 3.75" catback I smell it all the time even sitting in the car when it is at idle.

 

mine stinks too! the wife says it smells like a firecracker.

 

I have straight though 3" too and it smells bad..It's just part of the game..I know i need to get a new o2 sensor but no emissions is probably the cause of the stank....G