Car Makes A Rattle Sound When Accelerating To 40ks! Help

[baby34]

Hi, i get a rattling sound -I think its coming from my exhaust- at about 40k's.. when im revving it.....

when its on neutral it doesnt make the sound, only when im driving... i recently got my cat converter replaced so its not that, my muffler replaced (i thought it was that but it wasnt) so now i have no idea what it is and my mechanic doesnt know either.. any ideas? thanks

[R31Nismoid]

if its a rattle, something is loose.

probably and exhaust mount or something

[CR34M]

You would think itd be something like that, theres not much else it could be if its comming from lower areas near the exhaust :S

You said you replaced the cat and wasnt that, did they check the piping from the extractors etc? maybe something isn't holding/stuck there.

But the word rattling in general is quite broad without hearing the noise for ourselves...is it a deep rattling noise? A tinny rattling?

I don't know much myself but if it doesn't happen when your idling but happens around 40km/h and continues it could just be that a section of piping is loose and not held in place properly, and when more pressure is passing through, the noise therefore occurs??

I could be waaaay off the mark. Goodluck hope you get it resolved soon!

[baby34]

Nah nah, the rattle goes only for a quick second.. just at 40k's when im at 42. it stops.. and when i brake and go bak to 40 it does a lil rattle again..

[Julz89]

it culd be a rooted muffler? get under the car and hit the muffler with ur hand and see if u hear a noise.

[W0rp3D]

Mine does a similar thing but its only between 1500-2000rpm, been told its probably the gearbox.

[4drlvr]

mines doin the same, any idea on the fix??

[central coast person]

mines doing the same aswell and its a r33 like all of you, i sware it comes from the gear box........

i think it is bearings somewhere that are worn down?

the sound and where its coming from sounds like a bearing, are all of you getting the same rattle from the gearbox thats really deep at 1500rpm and once it hits 2000rpm its more of a quiet tin rattling sound then stops after 2000rpm.

anyone confirm that they think its bearings now

[baby34]

yeah. sounds like a deep rattle O_O it sounds like its coming from the exhaust to me (but it aint cos i got it checked out) Anyone HOW MUCH DOES IT COST TO FIX MORE IMPORTANTLY? aNYONE KNOW? APPROX?

[Basti]

well i dont think we can estimate unless we know exactly what the problem is - which we dont

[blind_elk]

What gear are you in? What ECU are you running?

(I'm guessing a spot of pinking).

[HtwCHACtkh]

I'm getting the exact same problem in my R33 SI GTS-T..

I just finished installing a FMIC (which was a bitch, damn clamps flying off) and only just started noticing it now that I'm listening extra carefully..

I did some diagnostic and noticed that if I push my clutch in while it's rattling the rattling immediately stops. I was in second gear, stock ECU.

Edited October 20, 2008 by Alinys

[baby34]

mines auto

[Jack88]

if it stops when you put the clutch in it could be the trust bearing but id be dam soprised if you could hear that making noise while ur actually driving! when sitting there ideling you can normally pick it because it will sound like something mechanical rattling around and when you push the clutch in it stops.

but i doubt it would be a thrust bearing.

[central coast person]

changing the clutch and all components of the clutch soon (after my 50thou rebuild is back together in a week ) so ill soon be able to see if it helped me or if its a problem that nothing to do with manual and auto differences. it might be the cat r the muffler because there relatively close to the gearbox to be mistaken because its just a crazy noise =\

[JezR31]

Sounds like the normal resonant noise na r33s make. RB25de's make a raspy rattly noise at around 3000rpm. Its even more noticable when you still have the stock exhaust.

[s1.533]

i got the same problems, with the stock muffler it was loud on take off. it rattle hard.

thought it was a broken muffler so i got a a cannon it was still there wasnt that loud tho. i was thinking it was the cat or the resonant

[baby34]

checked with mechanic today, its definately not the exhaust.. still dunno wot it is o_O

[central coast person]

seriously its going to be the clutch or gearbox. THE SOUND IS A DEAD BEARING!!!!!!! thrust bearing probity auto or manual i guess its got to be the same component, that is if were are getting that noise that we all say we have. someone take phone and record it. my car has no engine in it at the moment because of mods so i cant

[W0rp3D]

thrust bearing probity auto or manual i guess its got to be the same component

I think you will find that only manuals have a thrust bearing as it only works when with the clutch, i know the noise im talking about is not the thrust bearing as that is making a different noise