Hi all,

So the problem is, my car vibrates between 800 to around 1200 rpm, both in neutral and in the gears. So, whenever I accelerate from stop, it always gives me this heavy vibrating sound drrrrRRRRRRrrr~ :rant: but after that everything is smooth as silk. It goes the same way whenever I'm braking or slowing down (while the rpm is going down to around 1200 to 800.) The idle is totally fine, especially when the first time turning on the car (2k rpm) aside of the "weird 8's sound" which I think is normal.

** It's '04 MT 68,xxx miles for your info

After doing some research here, I might get the idea of what's going on:
1. loose plug/wire
2. bad coils
3. or engine mount (my VIN is actually on that range but I'm out of warranty now)

Well, I need some opinions on what else might be the cause of the problem and what should I take care of first. I'm currently saving money for my master degree so I'm kind of in budget :D :D :D But yeah, guess I'll spend whatever my 8 urges :P

Thank you all!!!

I believe in your research you've narrrowed it down to the correct 3.

Lol, ty

Ordered new NGK spark plugs, OEM coils and wire, will post the result after installing them.
Hoping the engine mount is OK :banghead:

mine is at the dealer as we speak i told them to check the engine mounts

keep us posted. my vote goes towards a faulty engine mount, though the plugs, wires, and coils are never a bad thing to replace!

my cars still there they gave me a free rental though so it's cool oh there also putting in a new ac compressor

How much do you have to pay for the engine mount? Are getting an OEM one or aftermarket? How about the labor? I need to get prepared :P

Anyway, coils, spark, etc haven't arrived yet, I'll keep you guys updated for the result

my car is still under warranty

How much do you have to pay for the engine mount? Are getting an OEM one or aftermarket? How about the labor? I need to get prepared :P

Anyway, coils, spark, etc haven't arrived yet, I'll keep you guys updated for the result
http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=214264&chapter=&sectionids=10,4117&groupid=10039&subgroupid=61113&make=22&model=RX-8&year=2004&catalogid=1&displayCatalogid=0

Someone correct me if I'm wrong but when you're decelerating in gear isn't the fuel cut? Therefore there should not be any spark involved.. which means this is probably not related to spark/ignition. I'd say the motor mount is probably the culprit.

Someone correct me if I'm wrong but when you're decelerating in gear isn't the fuel cut? Therefore there should not be any spark involved.. which means this is probably not related to spark/ignition. I'd say the motor mount is probably the culprit.
It's cut, but not to zero. The engine has to continue to idle.

http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=214264&chapter=&sectionids=10,4117&groupid=10039&subgroupid=61113&make=22&model=RX-8&year=2004&catalogid=1&displayCatalogid=0

-_____- I was like really happy when I saw the price BUT they actually split the right and left side. I've seen some post about aftermarket mounts, anybody got info on these?

my car is still under warranty

Ouch (for me), Nice (for you) :lol:

Mazsport has some custom mounts, but they move the engine back in the bay. This was to make room for their turbo kits.
I haven't heard of anyone else.

i just got the call that my car is ready i'll let u guys know what they tell me later on tonight

So phase, is yours vibrating with the same symptom as mine??
Let us posted

got my car back and yes it was the left and right side engine mount they also replaced some magnetic clutch i have an auto . and they also put in a new ac compressor.the service people said that alot of rx8 go in w the same problem.but it's fixed now doesnt shake/vibrate at all anymore.

mine is not vibrating as in car....however....my cluster makes a rrrr sound and so does my glovebox...i dont feel vibration though i just hear it.......can it be my mounts......im still under warranty....48 mo./50k mi.....i am on month 36 and at 44k mi... what do u think??? i took my car in before because of the vibrating sound and they said everythings fine....i never told them to chekc the engine mounts to where i never knew that can be it...? HELP!!

I don't think warranty covers rattle, doesn't it? But as long as you are under warranty, there is nothing wrong to have them check it out, you don't have to pay a penny for that :D

Rx8Phase: Nice man!! Enjoy your "new" car! lol

thanks

haha i know ha lol thanks and no they dont cover rattle but if it does vibrate then it's most likely ur moounts

Changed the sparks, coils, wires yesterday. Car performs better but the vibration is still there.....

therefore..

Engine mounts ouchhhh!