HELP: wicked vibration at speed - MustangForums.com



2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.
Sponsored by:
Sponsored by:

Reply
 
 
 
Thread Tools Search this Thread
Old 04-20-2012, 11:47 PM   #1
MrBlack2012GT
Thread Starter
 
MrBlack2012GT's Avatar
 
Join Date: Apr 2012
Location: Texas
Posts: 39
Default HELP: wicked vibration at speed

Hello everyone. My father purchased a manual 2012 Mustang GT premium off the lot last month. Black w/ saddle leather seats, manual, stock rear gear, tach redline glow, ambient lighting/mycolor etc., shaker 500 audio, sat nav delete, rear spoiler delete, stock rims/tires/brakes and it's impressive, apart from a very loud, very annoying vibration around the rear window/trunklid at speed.

The vibration starts at around 100 mph, in any gear, at any rpm. It vibrates the entire rear window and trunklid area. Sitting in the back seat and pushing on the rear window by hand when the vibration starts has no effect. I'm wondering if any 5.0 owners have had this problem or if anyone in general has heard about this? Thanks.

- Matt
MrBlack2012GT is offline   Reply With Quote
Old 04-21-2012, 12:11 AM   #2
bakerjd
5th Gear Member
 
bakerjd's Avatar
 
Join Date: Aug 2010
Location: North Carolina
Posts: 3,874
Default

Why do you need to go over 100mph?...


Don't really know what the cause could be. LCAs, UCA, rear sway bar?...have you got under the car and looked for loose bolts in the suspension? That would be where I would start.

Was it used?...maybe check the tires or look to see if the lug nuts are to spec?
bakerjd is offline   Reply With Quote
Old 04-21-2012, 12:18 AM   #3
808muscle
5th Gear Member
 
808muscle's Avatar
 
Join Date: Oct 2009
Location: Maui
Posts: 4,752
Default

Warranty. Take it in.
808muscle is offline   Reply With Quote
Old 04-21-2012, 12:30 AM   #4
BlackShelbyGt500
2nd Gear Member
 
Join Date: Dec 2011
Location: california
Posts: 373
Default

re balance the rear tire maybe.
BlackShelbyGt500 is offline   Reply With Quote
Old 04-21-2012, 12:40 AM   #5
MrBlack2012GT
Thread Starter
 
MrBlack2012GT's Avatar
 
Join Date: Apr 2012
Location: Texas
Posts: 39
Default

Quote:
Originally Posted by bakerjd View Post
Why do you need to go over 100mph?...


Don't really know what the cause could be. LCAs, UCA, rear sway bar?...have you got under the car and looked for loose bolts in the suspension? That would be where I would start.

Was it used?...maybe check the tires or look to see if the lug nuts are to spec?
It was brand-new, off the lot. There is no suspension noise while cruising around town, no rattles, squeaks, knocking or anything out of the ordinary, if I had noticed something like that, believe me, id be under there checking every nut and bolt within two minutes, but that's what is strange about this, everything is rock-solid. Until you get up over the speed limit a bit then something within the trunk or rear facia or tail lights etc. starts vibrating.

What we're thinking is air pressure gets into the trunk at speed and makes one of the plastic bits vibrate extremely fast against the trunklid, or something of that nature. The cause of the noise always seems to be air moving quickly through the car. Anyway I just thought i'd ask, maybe someone had the same problem with their 5.0 and could enlighten me on the subject.
MrBlack2012GT is offline   Reply With Quote
Old 04-21-2012, 05:54 AM   #6
300HorsesAndCounting
 
Join Date: Mar 2012
Location: New Jersey
Posts: 49
Default

Over the speed limit in a mustang? Who's ever heard of such a thing? Haha. But my 06 Gt had a rattle by the back convertible window even at normal speeds. Never found out what it was but it just went away. How long has it been going on. Could it also be on a bumpy section of road? Do you go on the same road every time you decide to go over 100?
300HorsesAndCounting is offline   Reply With Quote
Old 04-21-2012, 06:53 AM   #7
Nuke
6th Gear Member
 
Nuke's Avatar
 
Join Date: Jun 2007
Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
Posts: 16,186
Default

Quote:
Originally Posted by bakerjd View Post
Why do you need to go over 100mph?...
Since when does NEED have anything to do with it?...

Absolutely take it back to the dealer under waranty. It's possib;e the wheels wwere never balanced properly, you threw a weight, yada yada. Insist that they do a RoadForce balance.
Nuke is offline   Reply With Quote
Old 04-21-2012, 11:15 AM   #8
Young_Gun
4th Gear Member
 
Join Date: Oct 2010
Location: Indiana
Posts: 1,738
Default

In my 07 v6, I got vibration at and above 100mph just because of air resistance. You are pushing a lot of air at that point, and these Mustangs have the drag coefficient of a brick.
Young_Gun is offline   Reply With Quote
Old 04-21-2012, 11:57 AM   #9
BlackGT45th
2nd Gear Member
 
Join Date: May 2011
Location: Missouri
Posts: 380
Default

Maybe you just need to put a giant wing on the back!

In all seriousness take it in to get it looked at.
BlackGT45th is offline   Reply With Quote
Old 04-23-2012, 12:33 PM   #10
MrBlack2012GT
Thread Starter
 
MrBlack2012GT's Avatar
 
Join Date: Apr 2012
Location: Texas
Posts: 39
Default

Quote:
Originally Posted by 300HorsesAndCounting View Post
Over the speed limit in a mustang? Who's ever heard of such a thing? Haha. But my 06 Gt had a rattle by the back convertible window even at normal speeds. Never found out what it was but it just went away. How long has it been going on. Could it also be on a bumpy section of road? Do you go on the same road every time you decide to go over 100?
I've sped in different locations, highways in different states etc. and it doesn't seem like smooth roads help. We just got the GT brand new last month, it's not a convertible. We're taking it in this week. I honestly don't think it is anything mechanical, the car feels perfect until you get up to speed, and even with the vibration it still feels the same, it is loud and annoying but you can't feel it as though it's something like a tire or suspension component etc., you can just hear it, even over the shaker 500 speakers lol, hopefully i'm right and it's just a piece of plastic or trunklid touching something somewhere becuase of air pressure.
MrBlack2012GT is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
S197 Parts baddog671 Parts For Sale 20 07-26-2016 01:20 PM
Chassis wiggle when off throttle? UrS4 S197 Handling Section 10 10-03-2015 06:23 AM
So who wins uedlose The Racers Bench 4 10-01-2015 08:31 PM
New guy in AZ. First Mustang, First Manual, First car. BeatnikFink New Member Area 6 10-01-2015 08:00 PM
Rough idle and vibrating 4cylinderplus2 V6 (1994-2004) Mustangs 9 09-30-2015 05:26 PM


Tags
2007, 2012, 50, bar, car, cruising, engine, forum, loose, mustang, pulsing, speed, starting, sway, vibrates, vibration

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 02:46 PM.