Warble sound occasionally
10-02-2018, 09:03 PM
#2101
I'm dropping my vette off at MacMulkin tomorrow, they said one to two days to replace the rear end. It took over a week to ship to dealer. Hopefully ill have it back this weekend and post a positive comment.
10-04-2018, 10:33 PM
#2102
Instructor
Okay, I know the warble is irritating to us Stingray A8 owners, but here's a question that comes to mind. Has this annoying sound ever actually resulted in mechanical breakdown?
10-05-2018, 01:12 AM
#2103
Burning Brakes
As of this date, no one has had a mechanical breakdown. Not saying it hasn't but no one has come forth. I suspect it is a matter of time.
The following users liked this post:
Mensan150 (10-05-2018)
10-05-2018, 01:26 AM
#2104
Instructor
I had it and GM replaced the entire differential. The noise came in around 35 MPH and go away under acceleration. Good Luck! I have a 2017 Base Stingray Coupe. I put up with the noise for one year 3,000 miles.
10-05-2018, 02:51 PM
#2105
Le Mans Master
Member Since: Jan 2006
Location: Down south in Dixie
Posts: 6,801
Received 2,639 Likes
on
1,702 Posts
The warble started in mine with less than 100 miles on the odo. With 12,500 on the odo now so far no other problem has reared it's ugly head..
10-06-2018, 11:32 AM
#2106
Advanced
rattle
Rich, sorry to hear you are having a problem.
Hopefully the service department will do the easy stuff first like checking the fluid level in the differential.
Also for the 2014 MY C7 the belt tensioner created the kind of noise you are describing and I believe there is a service bulletin for the tensioner.
Good luck with the repairs and please post results .....tks.
Hopefully the service department will do the easy stuff first like checking the fluid level in the differential.
Also for the 2014 MY C7 the belt tensioner created the kind of noise you are describing and I believe there is a service bulletin for the tensioner.
Good luck with the repairs and please post results .....tks.
The following 3 users liked this post by Rich0071:
10-07-2018, 03:29 PM
#2107
I picked up my vette today, my drive home from MacMulkin Chevrolet was an hour drive with no warble sound. They replaced the entire rear differential. I'll keep driving for the next few weeks and hopefully it doesn't come back. I'll keep you posted.
The following 5 users liked this post by GASCAR:
joemessman (10-07-2018),
Mensan150 (10-13-2018),
Rebel Yell (10-07-2018),
Scruff Vette (10-10-2018),
walleyejack (10-07-2018)
10-07-2018, 04:27 PM
#2108
Le Mans Master
Member Since: Jan 2006
Location: Down south in Dixie
Posts: 6,801
Received 2,639 Likes
on
1,702 Posts
That's good news my friend. I hope you never hear that warble again.
The following users liked this post:
GASCAR (10-07-2018)
10-23-2018, 05:51 PM
#2109
Any Updates
2019 base A8 with the occasional warble sound. Occurs at 1500 rpm and ,occasionally, may not hear the warble for several days and then it returns. strange. One would think if it is rear end gears it would be continuous. Not certain I want the dealer to tear into the rear end or whatever since the car is flawless except for the warble. Transmission shifts very smoothly. It would be great if I could quote a TSB for my dealer.
The following users liked this post:
Rebel Yell (10-24-2018)
10-23-2018, 06:18 PM
#2111
Le Mans Master
Member Since: Nov 2015
Location: Lake Havasu City Arizona
Posts: 7,339
Received 3,447 Likes
on
2,063 Posts
I had a period of time when my warbled. I have 80K on the car now, but when it had about 37K it would warble for me at 1,400 pm when I let up on the gas once in a while. At about 41K it stopped doing it and never heard a peep again. Mine was unusual in that other reported ti when lightly throttling. Mine was upon deceleration. Go figure.
10-23-2018, 06:31 PM
#2112
Pro
It's my understanding that the issue isn't with the gears but shims that are used in the diff. They won't go into the diff but will just replace the whole thing.
10-23-2018, 08:57 PM
#2113
Le Mans Master
Member Since: Sep 2012
Location: Hagerstown MD
Posts: 6,877
Received 1,739 Likes
on
1,175 Posts
St. Jude Donor '15-'16,'18
They replaced the shims in my car, no new diff. Warble is gone, I still hear what sounds like gear whine but it could be the tires. I'm done screwing around as I'll be selling the car in the spring.
The following users liked this post:
Rebel Yell (10-24-2018)
10-23-2018, 09:26 PM
#2114
Pro
They did mine very early on when, I believe, all the knew was that it was from the diff but did not know exactly what it was. I didn't know that they were just replacing the shims now. The whole thing has sure been a cluster.
The following users liked this post:
Rebel Yell (10-24-2018)
10-23-2018, 10:00 PM
#2115
Might be a good call - some things are just not worth the time and the hassle to get them right.
I agree. It is not that GM screwed up - we all do. But it is their lack of a clear and consistent response to this problem which shows their lack of commitment to getting it right. They talk about a TSB which somehow never happens and the dealers are not in the loop on what to do while customers are left hanging after spending a lot of money on a dream car.
Definitely a cluster IMO.
It is too bad too, because the C7 is a brilliant design let down by a big corporation which does not really seem to care about its customers.
I agree. It is not that GM screwed up - we all do. But it is their lack of a clear and consistent response to this problem which shows their lack of commitment to getting it right. They talk about a TSB which somehow never happens and the dealers are not in the loop on what to do while customers are left hanging after spending a lot of money on a dream car.
Definitely a cluster IMO.
It is too bad too, because the C7 is a brilliant design let down by a big corporation which does not really seem to care about its customers.
The following users liked this post:
Rebel Yell (10-24-2018)
10-23-2018, 10:11 PM
#2116
Pro
Well said.
10-24-2018, 11:04 AM
#2117
I am new to the Forum and new to the Corvette world. I purchased a new 2017 Stingray spring 2018. I too have the warble noise...I brought to my local dealer and the lead Vette Tech road with me and heard the warble noise loud and clear. They kept the car, which after a week, they replaced the NPP exhaust telling me it was the valves within the exhaust (according to this thread, this seems to be the first thing that dealers focus on). Anyway, like the rest of you, I still have the warble noise coming from right behind the drivers side. I have read pretty much this entire thread and I find it hard to believe that the GM engineers cant find the problem with this noise. So I'll be taking my Stingray back to the dealer, with some of the highlights from this thread so that they know its a big problem within the C7's. Hopefully someones car will get fixed with a definite cause of the warble noise. I'll post any updates from my end. I sure hope GM finds the fix before the warranty runs out!!! Good Luck to everyone with this issue!
Last edited by Akcajunz; 10-24-2018 at 11:05 AM.
10-24-2018, 11:10 AM
#2118
Melting Slicks
Member Since: Nov 2012
Location: Gettysburg PA
Posts: 3,338
Received 1,880 Likes
on
1,012 Posts
2020 C8 of the Year Finalist - Unmodified
^^^ Geeze....... they are going backwards by 2 years.... the swapping out NPP exhaust was one of the first things they tried, which obviously didn't help.
Tell your dealer to call GM Tech Support and if that doesn't help or they look dumbfounded, tell them to call the Corvette brand Quality Mgr directly as he is VERY aware of the issue and fix. I've talked with him in person after GM Engineering bought my car back for this exact issue to use to get to the root cause. It's in the Differential. You can PM me if you want to. His name has been used in this thread several times in the last few months so I'm sure you can spot it.
Tell your dealer to call GM Tech Support and if that doesn't help or they look dumbfounded, tell them to call the Corvette brand Quality Mgr directly as he is VERY aware of the issue and fix. I've talked with him in person after GM Engineering bought my car back for this exact issue to use to get to the root cause. It's in the Differential. You can PM me if you want to. His name has been used in this thread several times in the last few months so I'm sure you can spot it.
The following users liked this post:
Akcajunz (10-24-2018)
10-24-2018, 12:28 PM
#2119
I agree, that is exactly why I will wait until I have a definitive TSB that my dealer can read. He is small, not a Kerbeck, and who knows where he will start to solve the problem. Likely the exhaust valves.
10-24-2018, 01:22 PM
#2120
Le Mans Master
Member Since: Jan 2006
Location: Down south in Dixie
Posts: 6,801
Received 2,639 Likes
on
1,702 Posts
My dealer is a small local dealer also, however they do have a very good Corvette tech. I've spoke with him quit a bit about this damnable warble, and he understands the entire situation as far as GM goes. We are on hold for a bit now, waiting on a TSB that may never come. If there's no indication of a TSB after the first of next year, we're going to go deeper into our conversation. I'm fairly sure he will do what I ask as far as replacing the shims on the diff. Then run it through on the warranty somehow. I will say that it's good to have someone that's actually on your side.BTW, I don't have any exhaust valves to start with. I would hate to think what they would do first in that situation.
Last edited by Rebel Yell; 10-24-2018 at 01:23 PM.