Well the dealer has had my car for close to a week now--and they are having a problem locating the source of this raspy rattle sound under WOT. I have an A/T and it is heard at about 4000RPM on up to redline. They have narrowed it down to a location between the engine and flywheel--anyone else experiencing this? The dealer-Jeff Haas Mazda-Houston- is pretty good; this just puts a crimp in my upcoming travel plans.

 

Well-they are going to replace the exhaust manifold-apparently as exhaust gases were being forced through the opening it was causing a metal shield to vibrate.

 

well that didn't solve the problem--anybody have a clue!?

 

does it happen everytime at wot and only at wot? and it's continuos from 4k up? you hear it all the way to redline and if you shift and keep on wot you still hear it?

 

What octane rating gas are you using?

 

hey I'm getting that raspy sound too! but mine's a MT and it only happens at low rpms, it goes away above 3000rpm.... (either it goes away or I can't hear it over the engine sound) and seems to randomly come and go as the car heats up or cools down... guess I'll ask about it at my next service, keep us updated!

oh and thanks for the description... I was trying to think WTH describes that sound... and AH HA! "RASPY!" :D

 

Well--I went to pick up my Millenia S (replace O2 sensor) from the dealer that was working on my RX8 as well--the exhaust manifold did have a leak that they replaced--but it appears the raspy noise could be from a batch of bad gas. I only use 93 octane--however it must have been a bad batch of gas; they filled it up again and the noise appears to be gone--they'll see if its still noisey tomorrow; if not then I'll be back RX8'in.

 

My bad on the bouncing username--I have registered several times and every time I log in it uses other names--gonna try and re-register before seeking technical help.

 

just log out and clear all of your cookies then log back in with the name you want to use. then you will only have the one cookie to auto log you back in. end of the bouncing username

 

Does anyone else have a high-pitched "jingly" rattle that only shows up from about 6000-6500 RPM? It also comes back from 8000-9000, but not as loud (or maybe it just doesn't seem as loud compared to the engine).

I've taken it to the dealer twice, but for some reason, they can't figure out what it is. They told me to not worry about it, cuz it didn't seem too bothersome to them.

Another thing - the rattle only happens with the car in gear. Revving in neutral while parked sounds perfectly fine.

BTW, I've already had the damper recall done. Hoped it would help, but it didn't - although the rattle does seem a little quieter now. Maybe they just didn't do it right?

Any ideas?

 

I have heard a rattle a few times before at WOT from a rolling start. I also have an automatic. It sounds like a can of rocks being drug from the bumper (which also sounds just like an automatic when its thrown into park from a slow roll.)
Could be the torque converter taking a crap.

 

The rattle is gone--so try octane booster or 93 octane--cuz it could be bad gas. Still haven't changed the cookies yet tho.

 

I get that noise also

 

Me too, some people on the boards say its detentation, or maybe you're using low octane gas. I've tried all different octanes of gas and I still get that noise. Must be california's crappy refined oils.

 

and I have only used 91 since purchase