I've had my '04 RX8 for about a year now and it started giving me a studering problem around 4000 rpm. It's almost got 65000 miles on it so i changed the ignition coils and i did the spark plugs bout 6 months ago but don't really know what causes this problem i got. Anyone know what i need to do to fix it?

 

any check engine lights?

 

I got no engine lights.

 

This stuttering
is it under hard acceleration or just mild acceleration
does it matter if engine is hot or cold
what is your fuel economy like ?

 

I'm getting a little less miles per gallon, it does it under mild and hard acceleration, and doesn't matter if engine is cold or not always does it. I don't think that causes the gas problem cuz i let the car warm up in the morning for like 15 minutes cuz its cold out there.

 

cat

 

try cleaning your maf sensor and replacing your air filter (if it needs it)

 

i asked a retired mechanic that used to work on RX7's but he wasn't much help. he had me clean the MAF sensor and i changed the air filter befor winter started.

 

does it rev out to 9000rpm and feel strong all the way ?

 

No, it studers a few more times befor so i realy don't take it past 7000

 

/\ you should have mentioned that


Think Zoom may be right in that case - cat

 

didn't think about that, don't take it that high often

 

/\ therein lies your problem - rotaries don't like that

 

well then, where can i get a good cat from? don't think I'll put OEM back in it

 

I would run a can of Seafoam on half or quarter a tank of gas and give her hell. It's $8 to see if you have some carbon or gunk buildup. If there is some improvement run another it might do it.

 

guess ill try the seafoam first

 

Are you running an aftermarket cat? I haven't heard of those clogging up. Just breaking/burning up. OEM cats can clog (they have for me). You are still under warranty for a factory cat.

 

+1 I smell kitty cat...

 

i got factory cat and warrenty went out i bit ago.

 

U.S. warranty on the OEM cat is 8 yrs/80,000 miles. You state that you are at 65k miles. That is well within the warranty period.

 

8 yrs/80000 miles on emissions devices.

 

i i i i it it it it so sos sous sous sound sounds sounds sounds sounds sounds like like li lik like like y y y y y y yo yoy you you you your your your your ca c c c cc a ca cca c acaat cat acat cattttttt.

 

... gotta check on the warrenty then but i dout it cuz the car came originally from new york and i bought it from a used car dealer hear in maryland. dont know if that affects the warrenty. but anyways i was thinkin in putting a high flow after market cat in it now.

 

i took the car to the dealer and they said its not the cat. they wernt sure what it could be so i'm kind of out of ideas.

 

Did you try SEAFOAM yet.....like disscused above....