bperr99116

4303 miles on Z07 A8. Here's a cut and paste of email from service technician:

Just left you a voicemail. Our technician has pinpointed the noise to the bell housing area. The noise is the transmission flex plate (also known as the flywheel) between the engine and transmission. Technician contacted General Motors technical assistance and a case has been started. We need to make sure the bearings in the engine are ok and then will have to replace the flywheel. I am sure you can imagine, this will not be a speedy repair, due to parts availability and complexity. I estimate having your vehicle for approximately one week.

Please let me know if you have any questions. I will keep you updated as soon as I have more information.

Anybody else?

Bob MacLean

Hi members,

I started hearing the rattle at like 2 or 3K miles.
Thought it was exhaust somewhere.. Had it diagnosed at 4K miles yesterday and dealer is sourcing a flexplate.
I worry that there is no redesign, but advisor said there was a new revision. Not sure I should trust this however.
I looked briefly at an aftermarket 1 that looks all welded with no rivets as far as I can tell, but out of stock at the moment while I wait a week for a GM flexplate.
Any thought on this aftermarket one? I hate to repeat flexplate replacement. http://weaponx-c7.myshopify.com/prod...i-flexplate-c7

THanks/FYI!!

DaveN007

FWIW...just passed 10k miles and no sign of problem recurring. The car also had an actual heat shield that was loose and making a buzzing sound that was just fixed. Unrelated, but the car is finally not making any extra noises. Lol.

Lear55pilot

I am so glad to have seen all posts - although sad we are having same problem on mine. I took it in at 500 for oil change and they said it was the torque converter - and said a big event to repair! I decided to get another opinion and took it to another dealer. They came back today with - guess what - FLEX PLATE! Also said that when they have replaced, they can see no damage or reason for the noise. Weird - but now will be without new car for 2 weeks.... Also - for those that have not seen - report out on the ZOs engine breaking due to the leaving of drill filings in engine and they cause bearing failure. BE SURE TO GET THE 500 mile change done on time! Semper Fi

robertbruce

Is this just a Z07 issue?

Lear55pilot

Dealer tells me that they have seen this only on C7 ZOs so far but it is quite new and mine showed up at 500 miles. Not a nice present for a new ride! I am on list for the C7.R order and am rethinking that now.

RichieRichZ06

It is not only a Z06/Z07 issue, as we have replaced one on an A8 C7 base model. It's also important to keep in mind that you want to find a dealer that has experience in replacing the flexplate in these cars. The procedure to bolt the torque tube collar up to the flexplate is very important to follow or you will have a repeat problem, similar to what some of the posts in this thread have stated.

FrcFed8

So is this luck of the draw or is every a8 going to have this issue? Mine is getting built in 2.5 weeks and don't really want to have to deal with this. So no new part yet?

Bob MacLean

My flex plate on my Base 2015 C7 with 4K miles is getting replaced while replying to this post and I have asked repeatedly if the same part number is going back in. The service advisor at the large vette dealer in NH keeps telling me its a new revision from the 2016 line. I'm always doubtful in my old age however and hope is the straight story.

Bob MacLean

I have the paperwork for my flex plate job but not the car.. They have to re-torque the torque tube bolts after some slight running then cool completely as part of the PIP5538A process..(I don't have the doc on the PIP to review) picking the car up after weekend as no time today.

The paper work shows part number of 12617579 and new bolts.
My Google shows this is at least in the 2014 C7.

I have been assured (maybe lied too :^) a number of times that the part going in is a new superseded part number. Even told this is the part in the 2016 model. I'm now having my doubts and will be quite miffed if the car has to get ripped apart again. Miffed may mean some more serious action has to be taken. I would think a new part number on the paperwork would look good like "Rev B" or something.

Maybe its a date code thing and the guy banging the rivets on the plate has a bigger hammer...

Not feeling good..

Macb

Bob MacLean

The PIP is PIP5238A

Macb

Lear55pilot

Just wanted to note that two weeks and finally got my car back. My dealer sent photos daily as job went on and I went to see the car with all back on but rear end which had to be done by body shop. In case you ever want to be sad - go see one when apart for this job! The plate they put in my 2015 shows 12647299 in case anyone wishes to compare. FYI - all new bolts MUST be installed and they took an extra week on them.

JoesC5

A friend with a 2015 Z07 was telling me Sunday that he has a rattle coming from the bellhousing area.

hcnerf

Took my new 2015 (2500mi) Z51 3LT 8spd in for roof noise and a ticking noise from the driver side of the engine. Was informed they are going to replace the flex plate and will have the car for a week. They also replaced the roof pins which they say fixed the roof noise. Hopefully the flex plate replacement takes care of what could have been a much bigger problem. I have noticed many other references to the flex plate issue. Mine was just a small ticking noise at idle which suddenly began happening and being an engine nut I immediately suspected a lifter.

docf

I'm surprised someone hasn't dropped a letter to Tadge on site regarding this matter as to the cause of the numerous Flexplate failures other than putting a new one in as to solution. Certainly there should be a recall, with a new design install.

Thomasmoto

Mine is on the lift right now getting a new flex plate.

docf

How long from when you first noted a problem to really knowing you had a problem? I take it that the rattle is present both at idle and driving? Does the intensity of the sound increase with time, does it increase when your driving. It will be interesting what the dealer says regarding new design vs. same old part installed.

Rd16rr

Its a significant rattle....like marbles being tossed around in the bell housing - annoying for sure - at idle only, in park or in gear - while driving its nothing at all, as the rivets are preloaded/stressed in place, so no rattle

I had 1 done at 2500 miles, and my 2nd one at 4500 (yes TWICE) There was no updated/revised part at that time...i'm not sure about now, but the 2nd Plate they installed was the same part # - has been ok since though

The second one was simply by chance....it started rattling as i pulled in for the Rear Differential replacement....the mechanic heard a slight rattle, and we both knew it was failing - he notified GM immediately and they swapped it while the Rear Differential was out

The Rear Differential issue started with getting a Service Rear Axle message, if you haven't seen my other posts, it was causing havoc with StabilTrac and Traction Control...really ruined the driving experience....as ST would kick in easily upon entering any turn (very annoying to have your brakes actuated intermittently) -- Track Mode was not always available, nor was Performance Traction Management -- after this fix at 4500 miles (over 10k now) it has been perfect (thankfully)!!

hootowlc7

Now isn't the flex plate between the crankshaft of the motor and the torque converter? If so, how I'm confused about the torque tube collar statement.

JoesC5

The flex plate(which has the starter ring) is attached to the crankshaft, but the torque converter is attached to the transmission at the rear of the car. Between the two, is the 6' long torque tube. At the front of the torque tube is a collar for attachment to the bellhousing.

Inside the torque tube is the prop shaft that connects to the flexplate at the front, and to the torque converter at the rear.

This how the Corvette has been designed since the 1997 C5.