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Rattle at 2700-3000 rpms

 
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Old 09-13-2008, 02:09 PM
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Rattle at 2700-3000 rpms

Well I have been hearing a rattle when i get the rpms up to 2700-3000 and figured it was a heat shield, but I went under the car and no heat shields or anything were loose. It sounds as though it is coming from the drivers side and i can't feel it vibrating or anything i just hear it. Anyone know what this could be i am stumped
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Old 09-13-2008, 02:25 PM
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Re: Rattle at 2700-3000 rpms

That rattle is usually the heat shield. did you try pulling the shield away from the chasis and see if it stopped?
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Old 09-13-2008, 02:35 PM
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Re: Rattle at 2700-3000 rpms

I will try that today after work but I was pulling and trying to shake it and it wasn't making any noise but i will try to put some steel wool in there for padding and hope thats the prob
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Old 09-13-2008, 02:51 PM
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Re: Rattle at 2700-3000 rpms

your flex pipe may have a hole in it. mine ripped and then it started rattling.
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Old 09-13-2008, 03:42 PM
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Re: Rattle at 2700-3000 rpms

could be the cat is broken also
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Old 09-13-2008, 07:40 PM
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Re: Rattle at 2700-3000 rpms

if it sounds like a raspy noise as well with the vibrating its your cat..mine is shot lol
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Old 09-13-2008, 11:10 PM
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Re: Rattle at 2700-3000 rpms

It doesn't vibrate but my cat is pounded out so could it still be a prob?
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Old 09-14-2008, 01:13 AM
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Re: Rattle at 2700-3000 rpms

could be why
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Old 09-14-2008, 01:15 AM
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Re: Rattle at 2700-3000 rpms

No cat will make that noise
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Old 09-14-2008, 05:19 PM
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Re: Rattle at 2700-3000 rpms

Also it doesn't do it everytime like some days it will do it on the way to the store or something but not on the way back
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Old 09-14-2008, 05:31 PM
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Re: Rattle at 2700-3000 rpms

cats DO make rattling noises. They can break apart inside, thus causing the rattle sound. I think this situation its more likely the heatshield is loose.
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Old 05-11-2009, 09:41 PM
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Re: Rattle at 2700-3000 rpms

so, this proves i searched
but i've got this same problem. just spent half an hour removing that damned heat shield. still does it. seems like it does it between 2-3K at WOT in 2 & 3 gears worst. i think it's coming from the resonator. could something have broken off in there?
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Old 05-11-2009, 09:49 PM
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Re: Rattle at 2700-3000 rpms

thank you for searching.


go under there and start banging around, see if anything starts rattling. do the entire exhaust system.
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Old 05-11-2009, 10:08 PM
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Re: Rattle at 2700-3000 rpms

i've tried and could never replicate the sound. i've tried hitting it with different things too.
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Old 05-11-2009, 11:56 PM
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Re: Rattle at 2700-3000 rpms

I've been having this same problem, very specifically between 2700 and 3000rpm.

My exhaust is total garbage though. I've pretty much ignored it until I can do something about the exhaust assuming it was the problem.
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Old 05-12-2009, 12:48 AM
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Re: Rattle at 2700-3000 rpms

what about:
-header heat shield?
-muffler heat shield?
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Old 05-12-2009, 10:11 AM
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Re: Rattle at 2700-3000 rpms

took the one off over the cat and resonator. i've heard from this guy that it could be the hangers. could that happen, they break off and rattle? i'll have to check that later today.
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Old 05-12-2009, 10:26 AM
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Re: Rattle at 2700-3000 rpms

check the handbrake cable brackets which should be attached to the chassis - sometimes they rust and break away which makes the brackets tap against the disc shields causing a rattling noise
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Old 05-19-2009, 11:28 PM
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Re: Rattle at 2700-3000 rpms

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Originally Posted by DrZoidberg View Post
took the one off over the cat and resonator. i've heard from this guy that it could be the hangers. could that happen, they break off and rattle? i'll have to check that later today.
i've recently had work done on my car and was told the undercarriage was in incredible condition for it's age. the coating protecting the bottom of the car can withstand the heat of the exhaust piping without a shield? if not, removal could prove troublesome for those who see snow in their area and don't store their cars for the winter.
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Old 05-19-2009, 11:45 PM
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Re: Rattle at 2700-3000 rpms

I still say its your heat shield, take it off or go to a shop and see what happens.

if your cat were broken and had pieces inside you would notice severe power loss
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Old 05-25-2009, 10:23 PM
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Re: Rattle at 2700-3000 rpms

i had the same EXACT problem. i poked around with a prybar and found out that both the brackets that mount the headers to the engine were broke. i replaced them (even though technically you dont HAVE to, but eventually it will crack your headers) and the problem went away. because you are having the sound at around 3000 rpm, im pretty sure it has something to do with header mounts or the headers themselves, because your engine is most turbulent at 3000 rpm. just check it out, it could be something simple as support brackets.
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Old 05-25-2009, 11:01 PM
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Re: Rattle at 2700-3000 rpms

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i had the same EXACT problem. i poked around with a prybar and found out that both the brackets that mount the headers to the engine were broke. i replaced them (even though technically you dont HAVE to, but eventually it will crack your headers) and the problem went away. because you are having the sound at around 3000 rpm, im pretty sure it has something to do with header mounts or the headers themselves, because your engine is most turbulent at 3000 rpm. just check it out, it could be something simple as support brackets.
100% correct. I had this same EXACT problem too and it was the same situation as yours; The mount on the downpipe had broken. Very difficult to see unless you are looking for it. I took it to a muffler shop for repairs and it broke again about 3 days later. I ended up breaking it off completely. Here is a pic from my cell phone..hopefully you can understand what is going on.



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Old 05-28-2009, 06:50 PM
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Re: Rattle at 2700-3000 rpms

^ I have kindof a buzz at 2400-2600 rpms... I have been assuming it was a heatshield since the exhaust is only 1 year old... I'll have to keep these mounts in mind next time we have it on the lift.
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Old 07-19-2009, 09:22 AM
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Re: Rattle at 2700-3000 rpms

Detonation?
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Old 07-20-2009, 01:11 PM
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Re: Rattle at 2700-3000 rpms

i didnt get a rattle but my header bracket cracked also however when mine cracked it split the exhaust too which became very loud so if it was rattling then i probably wouldnt of even noticed. this seems to be a common fault then.
i was even more unlucky tho cos when this happened to my exhaust the bonnet catch broke aswell so i couldnt open the bonnet to get to the exhaust, very annoying! but on the plus side if anyone cant open there prelude bonnet because the catch is broken give me a shout and i'll fill u in on how i managed to do it. nightmare tho
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Old 07-21-2009, 12:46 AM
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Re: Rattle at 2700-3000 rpms

The mechanic at the muffler shop said he was not surprised mine broke b/c of the sharp curve of the downpipe combined with the torque of the motor. He said eventually, something was bound to break. He recommended a custom header b/c they are generally designed better and also use "better" metals.
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Old 02-23-2012, 07:20 PM
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Re: Rattle at 2700-3000 rpms

I know this is an old thread, but I wanted to give my sincerest thanks for the header reference. I've had a rattle for 2 months that I have been trying to find, and searched the site last night to find this thread, and sure enough, my DC header mount was cracked EXACTLY like the one in the pic. Removed the broken piece, bent back the remaining mount, and no more rattle.

THANK YOU VERY MUCH!!!!!


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Old 03-22-2012, 05:07 PM
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Re: Rattle at 2700-3000 rpms

I'm having the same problem. I've tried Greddy and Ebay catback systems. Removed the header mount (as suggested above), and all heatshields. I'm running stock headers + cat delete, and the flex pipe is in perfect condition. All hangers and isolators have clearance, wtf is left....?
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