Originally Posted by mono01 (Post 1592736002)

The cooling fans on the radiator come on when the AC is on but they are in the front, no fan in the rear section. You may be hearing the fuel pump. You say a sound is being made from the rear when the fan is on, what fan are you referring to?

Originally Posted by Strake (Post 1592726800)

Bruce and Highplains,

YES !!!! The sound near the end of the video clip provided by Glenn E is EXACTLY what I'm hearing.

A8 Trans. 2016 Built Jan 26, 2016. Mag ride; NPP.

As we've already discussed many times:

Only heard when light acceleration
Best heard when going up a slight hill
Usually at 1200 to 1500 rpm
any gear, any mode, any exhaust setting, V4 or V8 mode makes no diff.
take my foot off the gas, and the noise goes away.
:iagree: Same as me. Mine built in October 2015.

I get NO jerking at any speed, or rpm. When going from V4 to V8 or back again is totally smooth. No issues there.

I heard this on day 1 driving home from dealer at about 40 miles.

Since I'm not a FB member, please pass my comments along to the FB folks.

thanks,

Richard

Originally Posted by bjones7131 (Post 1592736083)

dealer to me that there is a cooling fan on the left rear that makes a noise when it comes on.if you take the rear end off you will see a cooling fan to cool transmission. he said that is what the noise that I am hearing. now is there a fuel pump in the rear that will make a noise and when would it come on?

Originally Posted by bjones7131 (Post 1592736083)

dealer to me that there is a cooling fan on the left rear that makes a noise when it comes on.if you take the rear end off you will see a cooling fan to cool transmission. he said that is what the noise that I am hearing. now is there a fuel pump in the rear that will make a noise and when would it come on?

Originally Posted by Strake (Post 1592768198)

Are you a 2016, or a 2015? A8 trans ? NPP Exhaust?

Do you know the date of manufacture of your car? Or at a minimum, what month does the door sticker say your car was built?

Thanks

Originally Posted by Strake (Post 1592769137)

Which video did you send Chevy Customer Service? The one from Glenn, or the one I posted?

We should send BOTH videos.

Originally Posted by RichAshley-Black99 (Post 1592803234)

Any update?

Originally Posted by mono01 (Post 1592737232)

Did some more looking and your dealer is correct, if u have an automatic there is a small heat exchanger and small fan to cool the tranny. Get n a dark shop and shine a light in the long black mesh cover on the left side of bumper and u can see it. Kinda hard to see but mine has it, 2016 stingray automatic. Don't think the base m7 have it but the z51 and z06 ragtop should. The fan may be your noise. Hope this helps

Originally Posted by bjones7131 (Post 1591964313)

Car is new, less than 200 miles and at times i hear a warble sound, not sure if its tires road noise or what. Seems to make the sound when accelerating mildly after up to speed. Any thoughts or is this normal tire road noise. Thanks

Originally Posted by Strake (Post 1592732577)

I just uploaded my video/audio from a ride this morning.

"Warble" noise heard on 2016 Corvette C7 A8 Trans. NPP Exhaust. Most noticeable at the 35 to 40 second mark, 1:09 to 1:18 min and 1:42 to 1:50 minute mark, and 2:35 to 2:42 minute. Can also be heard less noticeably through out when going up hill. Most always at 1500 rpm, regardless of V4 or V8 mode, or any other mode settings. Light pressure on the gas pedal.

Here's the link to YouTube for the 3 minute video.

Please let me know if this is what YOU guys are also hearing......

https://youtu.be/Ra_svpk-t9E

Originally Posted by Strake (Post 1592732577)

I just uploaded my video/audio from a ride this morning.

"Warble" noise heard on 2016 Corvette C7 A8 Trans. NPP Exhaust. Most noticeable at the 35 to 40 second mark, 1:09 to 1:18 min and 1:42 to 1:50 minute mark, and 2:35 to 2:42 minute. Can also be heard less noticeably through out when going up hill. Most always at 1500 rpm, regardless of V4 or V8 mode, or any other mode settings. Light pressure on the gas pedal.

Here's the link to YouTube for the 3 minute video.

Please let me know if this is what YOU guys are also hearing......

https://youtu.be/Ra_svpk-t9E

Originally Posted by Ed Ramberger (Post 1592814054)

that is the EXACT noise I have provided the dealer with recordings of from my PDR IDENTICAL. I have several of them.

Originally Posted by Strake (Post 1592769137)

Which video did you send Chevy Customer Service? The one from Glenn, or the one I posted?

We should send BOTH videos.

Originally Posted by Highplains (Post 1592814114)

I hope your dealer can get something out of GM with the videos. My dealer has ridden in my car and states that the noise is clearly there and then took me for a ride in one of the dealership cars that displayed the same noise. But that's all that's happened. I think that this is just a big hurry up and wait for GM to take some sort of action. The dealers will do nothing until GM tells them what to do, if anything. In the meantime, the idea of a rotating mass loose or out of balance is what has me worried.

Originally Posted by Ed Ramberger (Post 1592814175)

Personally I believe this warble is in the exhaust. There is also a noise at 1000 rpm that occurs when the a8 keeps it in 3rd gear when I'm crawling in traffic. It's easily recreated by applying brake and gas in 1-2-3 gears and keeping rpm at 1000. Two different sounds.