Acceleration flutter/rattle
Team Owner
Joined: Feb 2000
Posts: 53,524
Likes: 77
From: Arizona
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
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 37
From: Green Bay Wisconsin
Ok thank you. A few questions if I may:
-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?
-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?
Only when the car is in drive at idle and also at a few thousand rpm under acceleration.
The Corvette mechanic at Broadway Chevrolet in Green Bay had experienced this before and if my memory serves me correctly there is a Service Bulletin on the Torque Tube Bearings rattling.
Douglas in Green Bay
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
Evan,
I was able to get the tech to drive the vehicle again yesterday on the interstate. He admitted that he still heard the noise, however, his suggestion after putting it on the rack was that he didn't think it was anything that would cause trouble and that I should drive the car another 5,000 miles. He stated that noise may be normal exhaust noise.
I politely insisted that a rocking/gurgling noise on acceleration is not normal for any vette or there would be others on here complaining of the same issue. I was basically brushed off.
Please inform me on how to escalate the matter further. I should not have a noise upon acceleration from the front engine area. That is far from normal.
There are a few things wrong with this situation:
1. When I dropped the car off on a Saturday and left, they immediately took the engine apart without even calling me to inform me. I was notified by an automated service message that "my parts had arrived." upon receiving that message I immediately called the dealership to find out what was ordered and why. I was informed they had taken the heads off and replaced the camshaft and lifters. Stunned that the service advisor would not call and tell me something major like this.
2. After picking the vehicle the same day I was informed of the repairs and told all was well, I drove the car a few miles only to realize the noise remained. Called back to the service advisor and he set me up an appointment to drop back by on a Saturday and have the same tech look at it that completed the work. Saturday rolls around and I'm there on time only to be told by another service advisor that the gentlemen(service advisor and tech who worked on my car) were BOTH OFF THAT DAY!! Nobody likes to be purposely mislead but this is exactly what happened.
3. Anyone reading this in Davidson County, stay the hell away from Carl Black Chevrolet. Very unprofessional to not take the time to inspect a problem(put the car on a lift and have someone put in gear and rev to the specific rpm range instead of just pulling the heads off and not even informing the owner). The tech even had the nerve to tell me while on the test drive that most Chevrolet techs envy Corvette owners for unkown reasons and that most of us are "priviliged". But he was different and he cared about his customers cars, what a load of sh*t.
I am going to keep at it until I find out what's going on
Last edited by MR_JLR; Aug 9, 2012 at 11:42 AM.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
So I was told it was the Borla Exhaust backpressure causing the flutter? I obviously disagree with this because it made the same sound with stock exhaust. Anyone else experience this with Borla Stingers?
Pro
Joined: Jul 2011
Posts: 515
Likes: 1
From: Boca ARton FL
Read the post but couldn't figure out if you had Borlas or factory NPP mufflers, my ZO6 muffler rattle at idle and just off idle all the time. I'm sure they can be adjusted but haven't checked the flappers yet.
Last edited by Kerrdogg; Oct 10, 2012 at 03:08 PM.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
axleback is Stingers. Right around 1900rpm you can hear it building up and then full flutter around 2500rpm. Medium to full acceleration only. Have been trying to get this fixed since March. Warranty runs out in December, very aggravating. I should be able to accelerate with no noise other than engine and exhaust.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
I did not. Upon trying to pinpoint the time it began, it started somewhere in between getting the oil pan replaced and having the stingers installed which were a month apart this time last year.
Just living with it as I have visited dealers since march of this year to find out the cause. Some have said exhaust, however they never put it on the rack and put it in gear to make sure because the noise only happens in gear. One shop thought lifters and camshaft, still the same noise after replacing those.
Just living with it as I have visited dealers since march of this year to find out the cause. Some have said exhaust, however they never put it on the rack and put it in gear to make sure because the noise only happens in gear. One shop thought lifters and camshaft, still the same noise after replacing those.
Pro
Joined: Apr 2011
Posts: 568
Likes: 4
From: Cambridge
Another tale of Chevy dealers swapping random parts, then when it stumps them they revert to............
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
Another tale of Chevy dealers swapping random parts, then when it stumps them they revert to............
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
I will try. I've lived with it since last November and sadly today is the last day of my 5year/100k factory warranty.
That was the very first thing I removed to try and isolate the noise. Def not the fuel rail covers. I even put microfiber towels under the stock intake as I notice it rattles a bit, that wasn't it either.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
Another tale of Chevy dealers swapping random parts, then when it stumps them they revert to............
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
"It's your aftermarket bits sir..........."
Standard service to expect I'm afraid. Oh, and you'll get the odd compassionate pm from a service rep on here which will amount to nothing. It's just designed to reassure the community!
It's a shame they make such a wonderfully addictive and good value sports car or I'd take my business elsewhere!
Good luck, reckon you could get some sound clips of it?
I will try. I've lived with it since last November and sadly today is the last day of my 5year/100k factory warranty.
That was the very first thing I removed to try and isolate the noise. Def not the fuel rail covers. I even put microfiber towels under the stock intake as I notice it rattles a bit, that wasn't it either. I bought some clamps to tighten up around the rubber exhaust hangers, gonna try to get those on this week and see if it actually is the exhaust moving around.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Did you ever have the cats checked properly? Is it the stock cats on the car? When the fall apart they make noise under acceleration and do not throw any codes. Ask me how I know.
Thread Starter
Pro
Joined: Apr 2011
Posts: 689
Likes: 47
That looks like it could have been an annoying problem. I had the stock cats/manifolds/x pipe replaced with 2008 z06 component that had less than 1,000 miles on them. Removing those got rid of a pinging sound I was hearing on the drivers side at idle by leaning in and sticking my ear next to the brake fluid reservoir. I did the upgrade in hopes it was faulty cats.
Instructor
Joined: Jun 2013
Posts: 217
Likes: 7
From: Hampton, GA
https://photos.app.goo.gl/5sHKyzA5oD8jmez46