Smells like sulfer or worse, maybe unburned gas??? Help?? Non Turbo.
What to check or change? Engine runs pretty good, if i dont start and warm up though it will flood next time i try to start...

 

did you had any engine work done like you cleaned the intakes or did you gutted/remove the cats?

 

i have done nothing, i bought and the guy did give me a header he had, said he took it off and put cat on he got from mazda trix, dont know if its new or used...

 

it sounds like youre running rich..not too big of a deal but your gas mileage might go down a little bit, and you might pop some nice flames

 

Welp if it stinks then more then likely ur cat is either shot or not there. Welcome to the rotary, they always stink.

 

so if it is the cat and i put on a header would it still smell? If it is not the cat what else could it be??? I want to drive it but it stinks...

 

If you take off the cat and put on the header it will probably smell even worse. Smelly exhaust is just a fact of life with an RX-7.

 

I used some gasket remover on my intake a while back... It smelled almost like urine for about 100 miles... Then it burned off... Maybe the guy that sold you the header used some of that on the header? Just a thought...

 

the cat is on now.... I never had the header on....

 

a bad cat will stink like rotten eggs. unburnt fuel smells horrible and will make your eyes water.

 

my car smells like a lawn mower. get a new o2 sensor. it helped me.

 

i think it is unburnt fuel, not rotten eggs...

 

Yeah I bought new cats for my 7 and they smelled for a good 500 miles before they broke in. But the cats can smell bad when they get hot and a cheap replacement will not take the heat of a rotary very well and will smell too.

 

the smell happens as soon as i start it even when cold . could it still be a cat or normal? pewwwwwww!

 

replace the o2 sensor... it is a $17 part and will save you gas mileage and fix your A/F mixture problems. even if it does not fix the problem it will help in other departments. it did reduce stench on my car though.

 

make sure the EGR valve is intact. check for exhaust leaks BEFORE the cat (ie cracked manifold, rusted piping etc..). make sure the charcoal canister is intact.