Acceleration flutter/rattle
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
Acceleration flutter/rattle
with medium to full throttle happens right at 2300 rpm to 3000 rpm before the lovely stingers drowns out the sound.
Here's what I've done so far
isolated intake, brake cooling ducts etc, still rattled
replaced rubber shifting bushings just in case, still rattle
took it to the dealer saturday, tech drives it and hears the noise. Hooks up tech 2 and says random misfire cylinder 2. They end up replacing all 16 lifters, and putting in a new camshaft. Also got new valve covers, head gaskets, and exhaust manifold gaskets(this was my next guess). Call me and tell me vehicle is ready yesterday. Get it out today and let it warm up before giving medium throttle again and hearing the exact same noise,
what else can cause this? Noise differs between hard rocking sound to sounding like paper flapping in the wind. Very annoying. Any help is greatly appreciated, thanks
Here's what I've done so far
isolated intake, brake cooling ducts etc, still rattled
replaced rubber shifting bushings just in case, still rattle
took it to the dealer saturday, tech drives it and hears the noise. Hooks up tech 2 and says random misfire cylinder 2. They end up replacing all 16 lifters, and putting in a new camshaft. Also got new valve covers, head gaskets, and exhaust manifold gaskets(this was my next guess). Call me and tell me vehicle is ready yesterday. Get it out today and let it warm up before giving medium throttle again and hearing the exact same noise,
what else can cause this? Noise differs between hard rocking sound to sounding like paper flapping in the wind. Very annoying. Any help is greatly appreciated, thanks
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I hope it's not the mufflers rattling against the transmission after they did all that...exhaust hitting often shows up on scans as detonation and my Borlas would rattle unless they were adjusted perfectly.
Look for shiny spots on the mufflers and pipes. If possible, look while on a drive on rack like an alignment rack as you want the weight on the wheels when checking.
Look for shiny spots on the mufflers and pipes. If possible, look while on a drive on rack like an alignment rack as you want the weight on the wheels when checking.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
93 Shell
I hope it's not the mufflers rattling against the transmission after they did all that...exhaust hitting often shows up on scans as detonation and my Borlas would rattle unless they were adjusted perfectly.
Look for shiny spots on the mufflers and pipes. If possible, look while on a drive on rack like an alignment rack as you want the weight on the wheels when checking.
Look for shiny spots on the mufflers and pipes. If possible, look while on a drive on rack like an alignment rack as you want the weight on the wheels when checking.
There is dry brown stuff on the driver side motor mount but I had a Corvette mechanic(Doug Ward) in Knoxville look over the vehicle a few months ago and he stated that the motor mount was ok. That was my first suspicion. Hopefully can get this squared away this Saturday but still wanted opinions from other owners.
Last edited by MR_JLR; Aug 1, 2012 at 10:54 PM.
Pro
Joined: Nov 2004
Posts: 729
Likes: 18
From: Oxford Pa
St. Jude Donor '05-'10-'12, '15
I had a similar "rattle". I turned out to be the passenger side rear o2 sensor was 1/2 turn loose. Had a heck of time trying to tighten without taking it apart. Once I tightened it, all the noises went away. At one time I thought it was the cat falling apart inside the pipe.
Hope this helps and good luck,
Noe
Hope this helps and good luck,
Noe
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Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
I had a similar "rattle". I turned out to be the passenger side rear o2 sensor was 1/2 turn loose. Had a heck of time trying to tighten without taking it apart. Once I tightened it, all the noises went away. At one time I thought it was the cat falling apart inside the pipe.
Hope this helps and good luck,
Noe
Hope this helps and good luck,
Noe
I've mentioned that but the techs seem certain that the car would be giving a code if the cat wasn't functioning properly. If they say they can't find anything tomorrow I will have an independent shop remove the cats and inspect them.
SUBVETTE
Joined: Jul 2006
Posts: 3,841
Likes: 93
From: San Diego CA
Good point. I changed my tunnel plate to the insulated and thicker plate made by Elite Engineering when I installed headers. When I did, I found about a half dozen of the mounting bolts were loose on the original.
Melting Slicks
Joined: May 2006
Posts: 3,201
Likes: 189
From: beach
St. Jude Donor '13
This may sound ridiculous, but I had a similar sound about 3 weeks ago. It was driving me mad. The power steering pulley has a push in pin that acts as a dust shield. Its a plastic POS that had walked out 3/4 off the way and was creating the exact sound you are describing above 2000RPM and it was driving me crazy. I pushed it back in and guess what? No more sound. You might check it. Hope that's the problem. Good luck.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
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This may sound ridiculous, but I had a similar sound about 3 weeks ago. It was driving me mad. The power steering pulley has a push in pin that acts as a dust shield. Its a plastic POS that had walked out 3/4 off the way and was creating the exact sound you are describing above 2000RPM and it was driving me crazy. I pushed it back in and guess what? No more sound. You might check it. Hope that's the problem. Good luck.
I will check into the Power steering pulley to see if I can find what you're referring to in the meantime, thanks
Thread Starter
Pro
Joined: Apr 2011
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I am supposed to return Wednesday, another service advisor stated he would tell the tech who worked on the car that I would be returning weds evening. I'll keep you posted as this is "currently" the only issue I have with my Vette.
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 37
From: Green Bay Wisconsin
Hello,
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Hello,
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
Last edited by Joe_G; Aug 6, 2012 at 09:18 PM.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
Hello,
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
My vette has the same rattle and it comes from the torque tube bearings. I had them replaced twice under warranty and a few thousand miles later the noise returns.
I have been driving it for 2 years with the noise and it is not getting worse so I am only going to have them replaced again if the noise gets worse.
The dealer said it was a 12 hour job last time so I would expect $1,000 plus labor bill.
Douglas in Green Bay
-Do you remember how they diagnosed it? Hopefully by putting it on the rack. The tech drove it last saturday and thought it was coming from the engine without even putting it on a rack to check and see. At least I was in the car riding with him when he heard the noise so they can't say it's not there.
-Do bad torque tubes have rattles at idle?