Vibration diagnosis
Thread Starter
3rd Gear
Joined: Aug 2017
Posts: 3
Likes: 1
Vibration diagnosis
I have a 2014 C7 Automatic standard package. I have over 100000 miles and have a vibration I want to diagnose. When I'm over 20 mph I hear a metallic sound as I am slightly applying gas. The sound is similar to the sound heat plates around the exhaust makes on most other cars when loose, but a consistent pattern This happens all the time when the car starts to go up a slight incline or when keeping cruising speed. Sound goes away when speed is slightly increased. The car will have a more profound vibration under the same conditions but the speed is above 65mph. My guess is the driveshaft, but would like to rule it out before I invest $1200.
Race Director
Joined: Oct 2008
Posts: 16,670
Likes: 7,737
From: NJ
don't spend a penny until it is properly diagnosed and with the understanding in writing that the repairing facility is changing THE PART/S that are creating THAT issue.. otherwise you could throw parts at the car all day long...
My guess is broken cat media or torque tube/bearing issue. what does it do if you power brake the car at zero mph in forward and reverse?
My guess is broken cat media or torque tube/bearing issue. what does it do if you power brake the car at zero mph in forward and reverse?
Advanced
Joined: May 2016
Posts: 58
Likes: 11
I have a 2014 C7 Automatic standard package. I have over 100000 miles and have a vibration I want to diagnose. When I'm over 20 mph I hear a metallic sound as I am slightly applying gas. The sound is similar to the sound heat plates around the exhaust makes on most other cars when loose, but a consistent pattern This happens all the time when the car starts to go up a slight incline or when keeping cruising speed. Sound goes away when speed is slightly increased. The car will have a more profound vibration under the same conditions but the speed is above 65mph. My guess is the driveshaft, but would like to rule it out before I invest $1200.
Drifting
Joined: Sep 1999
Posts: 1,871
Likes: 247
From: Weatherford TX
This may be out in left field, but the 14's had a problem with the belt tensioner leaking it's hydrulic oil and causing a noise when car went from 4 to 8 cyl and then back to 4 cyl operation. I thoguht it was somethng loose in the dash for sure.
Safety Car
Joined: Nov 2012
Posts: 3,987
Likes: 2,606
From: Gettysburg PA
2020 C8 of the Year Finalist - Unmodified
Have you checked out this thread "Warble Sound Occasionally" ? So is your's a NOISE, or an actual VIBRATION?
https://www.corvetteforum.com/forums...asionally.html
It is a harmonic resonance vibration noise caused by a faulty ring and pinion in the differential.
I have a YouTube video clip posted in there several times that depicts the sound.
It's always at about 1500 rpm, light foot on the gas. Any gear, any driving mode, any exhaust setting.
https://www.corvetteforum.com/forums...asionally.html
It is a harmonic resonance vibration noise caused by a faulty ring and pinion in the differential.
I have a YouTube video clip posted in there several times that depicts the sound.
It's always at about 1500 rpm, light foot on the gas. Any gear, any driving mode, any exhaust setting.
Last edited by Strake; Aug 24, 2017 at 09:52 AM.
Advanced
Joined: May 2016
Posts: 58
Likes: 11
Have you checked out this thread "Warble Sound Occasionally" ? So is your's a NOISE, or an actual VIBRATION?
https://www.corvetteforum.com/forums...asionally.html
It is a harmonic resonance vibration noise caused by a faulty ring and pinion in the differential.
I have a YouTube video clip posted in there several times that depicts the sound.
It's always at about 1500 rpm, light foot on the gas. Any gear, any driving mode, any exhaust setting.
https://www.corvetteforum.com/forums...asionally.html
It is a harmonic resonance vibration noise caused by a faulty ring and pinion in the differential.
I have a YouTube video clip posted in there several times that depicts the sound.
It's always at about 1500 rpm, light foot on the gas. Any gear, any driving mode, any exhaust setting.
Thread Starter
3rd Gear
Joined: Aug 2017
Posts: 3
Likes: 1
Problem solved!
It was the belt tensioner. Chattering has stopped and no more vibration. Thanks!!
Advanced
Joined: May 2016
Posts: 58
Likes: 11
Not out in left field at all. I finally got mine back after another week in the shop. I had to take the service manager on a ride to reproduce the sound which wasn't hard to do, but they apparently were unable to do. Final diagnosis, belt tensioner leaking. They replaced it and now it is quiet. I wish the dealers had as knowledgeable people working on Corvettes as this forum. You were spot on. Thanks!
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Melting Slicks
Joined: Sep 2004
Posts: 3,477
Likes: 2,247
From: Southern NJ
Not out in left field at all. I finally got mine back after another week in the shop. I had to take the service manager on a ride to reproduce the sound which wasn't hard to do, but they apparently were unable to do. Final diagnosis, belt tensioner leaking. They replaced it and now it is quiet. I wish the dealers had as knowledgeable people working on Corvettes as this forum. You were spot on. Thanks!
Trying to help my dealer diagnose the source of the noise.
Thanks!
Advanced
Joined: May 2016
Posts: 58
Likes: 11
Having a similar issue on my 2016 Z51 vert. Did the issue sound like a Rattlesnake or if you loaded a hollow tube with small beads and tilted it back and forth? I hear this sound at 1500 rpm in V4 mode only. Disappears at higher RPM and in V8 mode.
Trying to help my dealer diagnose the source of the noise.
Thanks!
Trying to help my dealer diagnose the source of the noise.
Thanks!
Melting Slicks
Joined: Sep 2004
Posts: 3,477
Likes: 2,247
From: Southern NJ
Yes, similar to your description. The dealer couldn't reproduce the sound so I had to take the service manager out for a drive. i was able to reproduce the sound at will. at 1500 RPMs apply slight pressure to the throttle and the sound will come back. I still feel a very subtle vibration going through 1500 RPMs and I believe that is due to the flex plate issue they supposedly fixed. Are you able to reproduce the sound at will? I would definitely have them check the belt tensioner first. Good luck. Those little noises and vibrations can be frustrating and annoying.
