Rebel Yell

Maxie, that doesn't work, wish it did. I have tried mine in manual mode (V8 all the time), and even with that you have to keep the rpm's past that magical 1500 mark to keep the noise at bay. I even let mine do what it wanted for over 500 miles, and the noise while annoying never got worse. Stumped I am.

Maxie2U

I'm curious, did GM give you blue book (trade-in) value for your car and then you have to pay the difference for the 3LT GS? If yes, did they give you an MRSP discount equal to what other dealers (like MacMulkin) are giving?

Timohio

[QUOTE=bjones7131;1593158720]I'm like you I really don't want another model or spend more money. I kept my last vette for 8 years. I would prefer just to have it fixed. There is no way that GM will buy back all these cars. Trade is one thing , but a buy back where you walk away and buy a different brand is another.

kp

First time I noticed this thread.

FWIW I had a '14 with an A6 (non NPP) and it made the same noise, drove it for a year, annoyed me almost every day lol. My '16 A8 NPP also has it but you have to try a little harder. And to make it even more interesting I have driven at least a half dozen other auto trans C7s, Z51 and non, and most of them you could make do it. Friend of mine sells high end import sports cars and has me look over C6/C7 trades for damage/mods before he decides to sell them himself or auction them off so I get a chance to drive others besides mine.

I originally thought it was a V4 issue, but as mentioned here it will do it on the highway in 8th (or 6th with the A6) around 1500rm in V8, light throttle, especially on a long grade. Went so far as putting a go pro camera and a 12v light under the hood to see/hear what was going on. I thought it was coming from the rear but passengers claimed it was coming from the front.

Either way, could not really hear anything distinct from the camera under the hood, but you could see the engine shake when you heard the noise. I dont know if its a cam phasing or tune issue where the engine is lugging at that rpm or just a bunch of factors lining up to produce a harmonic vibration of some kind.

Many people do not notice, or if they do they don't care. I don't care really, it annoys me, but I'll just drop it down a gear and motor on. If it was just my car doing it I would look into it more. Haven't found a perfect car yet from any manufacture..

Hopefully GM will figure out what it is, would not mind seeing a fix but I'm not holding my breath. Kudos to you guys for pursuing it with the dealer and GM.

RichAshley-Black99

Mines a 2015 2Lt Non Z51

Rich

tnbirdieman

I think I am the latest victim of this issue. 2016 Z51 A8 2LT with 6950 miles on it and purchased 06/2016 and built 11/2015. On my way to work this morning out of nowhere I start hearing a metal on metal grinding sound. I am able to reproduce it at will and its loud. Its always at 1300 to 1500 RPM either as soon as it goes from V8 to V4 or as it is just about to go from V4 to V8. I can make it last almost indefinitely by very lightly applying throttle or holding it where it is at or I can make it go away by applying moderate throttle or letting off gas completely. I don't know If I would describe it as a "warble" but it does not sound good at all. Sounds like metal on metal kind of like what you hear when a car has no brake pads left on it. To me the sound is coming from under the console or just to the right of it and under the car. Taking it to dealer later today or in the morning. I can not believe my car started doing this. To say I am disappointed is a MAJOR understatement.

Highplains

A metal to metal grinding sound does not sound like the "warble" I'm familiar with. Have you listened to Richard Straker's video to compare the noise you have with his? GM is using it as the hallmark warble noise in their research on this. See this on YouTube:
If your sound matches this, you will want to get a case number opened at your dealer but with the cause of the problem undetermined, I wouldn't let them do anything. In the past, dealers have just thrown new parts at the cars accomplishing nothing but frustration for everyone.

bjones7131

Try driving in manual with the paddles and see if noise goes away, doing this keeps the car from going into 4 cylinder mode and the afm valves are rendered open. Lets us know what happens with this process and what the dealer says. Bummer

white90conv

The sound in my 1000 mile 2017 a8 sounds just like the sound in the strake video. It is not a grinding sound at all. I am just waiting to see if this thread suggests a solution.

tnbirdieman

Just left my service dealership (car bought 500 miles away at Criswell) and took the service manager for a ride. He immediately said the torque converter is going out and a new one is on the way. My car will also make the sound for about 2 seconds about 10 feet before it comes to a complete stop. It will not make the sound at all in M mode. My sound is totally different than the one in the video but the way to make it happen and or not happen is EXACTLY the same. I can also feel it in the steering wheel when it happens. My car is a Z51 so maybe the problem is the same but the sound is not due to different parts. I have multiple examples of my sound on video while driving but don't know how to post videos to YouTube.

Highplains

Richard Straker, a forum member who posted the video, had his car bought back by GM. They are taking it to Detroit to take apart an find the source of the noise. Once that occurs, they should release a TSB to all the dealers on what the fix is. However, this may be several months in the offing. In the meantime, I have yet to hear of any harm done to a vehicle yet. What is most interesting about your post is that you're the first person I've heard of with the "warble" in the 2017.

bjones7131

Pete it may be because the 2017 have just hit the streets and not enough run time or folks just haven't figured it out or haven't stumbled onto this post. Lets hope the 2017's aren't plagued with this problem. There may be hundreds or thousands of these vettes with this issue. This could be a very costly fix for GM.

Highplains

bjones7131

Just heard from a guy on fb stingray group who has same issue, this is his comments:
They had it 3 days last week and finally started hearing the problem. Service advisor (SA) says he can now almost duplicate it at will. I took it back to them this morning and they connected the sensor kit. Just heard from them and SA says the sensors narrowed it down to the differential. Called GM and GM says first they should try replacing fluid in rear end, and if that doesn’t work, plan on replacing the axle assembly. SA doesn’t think fluid will fix it, but that is first step according to GM. Should hear back tomorrow on status.

I read behind another certified mechanic who said he thought it maybe the fluid and he changed his himself and will provide feedback when he gets some run time. I think this is wishful thinking but what do i know.

Highplains

I'm surprised GM isn't waiting for the outcome of the tests on the Straker car.

bjones7131

That is another thing that bothers me, i don't think the GM ENG. are sharing info. I wonder if they are just string us along. If this is as big a deal as we have been led to believe you would think they would tell whomever in GM to hang tight until they diagnose and come up with a fix but obviously this isn't happening for whatever reason.

Ed Ramberger

This whole thing is like a clown funeral - tragically hilarious. From what I've seen, many of the dealers don't understand these cars yet and/or are so arrogant they don't even realize that they don't understand basics anymore, GM isn't talking internally - dealing with the Exec office doesn't help, numerous people have the issue yet no one really truly acknowledges it, the parts shotgun is firing away with duplicate repairs to no avail. Someone please tell me how a 70K car got released like this and we're supposed to suck it up while, if we're lucky, a sub par trade out deal is offered because it's obvious they're trying to fend off the lemon law cases because once that floodgate opens it's going to blow back on them hard.
This should be an all hands on deck, fix this situation event. Has no one got any shame any more?

For goodness sake, they put differential fluid in my car for the 1,000 noise and the 1,500 warble - don't they understand diff clutches are locked in a straight line??? I actually had to explain a differential to the service writer and when pressed the tech admitted it was just a try. Well chalk up a swing and a miss in the repair attempt column.

Our money was green enough for the dealer and GM to take - where the Hell is the service? And while I'm at it, why the Hell isn't Bruce's car fixed - he started this freaking thread 557 posts ago.

Then, they start talking about torque tubes, diffs, trannys - guess what - no chicken dinners there either. I got an IM from a guy where they replaced his fuel injectors for this...HIS FREAKING FUEL INJECTORS!

I have an idea, lets see how much major surgery we can have done repeatedly because no one at GM and the dealers is sharing information. Then they can have all these cars back and they can examine them all. Maybe when it starts to hit them in the wallet they will care.

And I don't want to hear how we should all wait while they look at Richards car. Many of us have been strung along and promised the same things for months but it was empty.

GM just fix these cars or get us the hell out of them fairly. My next rant is going to be an open letter and certified letters to Mary Bara and every executive up the chain. And I have so many PDR recordings that show this that I will try to reach as many people as possible to prevent them from going down this road. We trusted you and in good faith bought these cars. DO THE RIGHT THING GM!

ersatz928

My money is on an inadequate (undersized) bearing design (or improperly hardened races/***** in the bearing) in the torque tube or diff...that's what it sounds like to me.....

BOBSZ06

For those that rotated their wheels, how did this work out?

Highplains

It has occurred to me that we could turn this into something more positive with a lottery to be won by the warbler who guesses or comes nearest to the reason GM says is the cause of the noise-that is,if indeed they find it at all. The winner gets a new, non-warbling ZO6 provided by GM. I'm sure that Ms. Bara, GM CEO would just jump for this....