2003 Liberty makes humming noise and vibration during deceleration - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > 2003 Liberty makes humming noise and vibration during deceleration

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRubicon Express Suspensions from CCOR 706-207-4140Smittybilt Hard Tops @ Oconee Off-Road! 706-534-9955

Reply
Unread 10-24-2013, 09:48 AM   #1
bhawkins1978
Registered User
2003 KJ Liberty 
 
Join Date: Sep 2013
Location: Monroe, NC
Posts: 2
2003 Liberty makes humming noise and vibration during deceleration

I have a concern regarding the noise being generated when i decelerate. The car runs perfectly fine if i keep it at low speeds like when I drive around the neighborhood. When I manage to get it up to about 30+ MPH, when i let off the gas, I can hear a faint humming sound. When i put my foot back on the gas, the humming goes away. As I decelerate, the humming becomes a bit more noticable, and if i break, it becomes very noticable, and i can feel a slight vibration in the petal and in the floor when it gets down to about 10 MPH to when it stops. I rarely get to real highway speeds, but i'm pretty sure the last time I did, I heard the same faint humming while driving at a constant speed of 65-70 MPH. Though, like I said, none of it happens if i keep the car at slow speeds, so I'm pretty confident it doesnt have to do with the brakes or wheels.

Recently (3 weeks ago), I had the transmission fluid changed, and found that it was about a half qt low in fluid, which i've since added. I've read that it might be the u-joints on the driveshaft, but if it was them, wouldnt the vibration occur during acceleration as well, or at least every time the car was decelerating?

Can anyone relate to this problem, or have any recomendations of what might be the cause?

bhawkins1978 is offline   Reply With Quote
Unread 10-27-2013, 12:36 AM   #2
LJameson
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2008
Location: Elizabeth Lake, CA
Posts: 3,756
Could be the upper control arm bushings are bad, causing the driveline angle to be off when you decelerate.
__________________
"Anything to do with the land, I love."
"So it's probably eighty percent luck and twenty percent skill."

-Chris LeDoux

I never could figure what the sky was thinking, but the soil, she don't keep too many secrets.
LJameson is offline   Reply With Quote
Unread 10-30-2013, 01:07 AM   #3
JohnCrabtree
Registered User
1994 ZJ 
 
Join Date: Mar 2013
Location: Sonora, California
Posts: 314
Could be a tire imbalance. A Radial Imbalance will be evident at low speeds also, however, a dynamic imbalance may only be evident at high speeds.

Bent driveshaft or a weight fell off of the driveshaft. That would be noticable when accelerating also, however, your engine may be making too much noise for you to hear it.
JohnCrabtree is offline   Reply With Quote
Unread 11-02-2013, 06:14 PM   #4
rjbruzan
Moderator
2004 TJ Wrangler 
 
Join Date: May 2008
Location: Lake in the Hills, illinois
Posts: 2,045
The reason it hums is it doesnt know the words.
__________________
Of all the things Ive lost
The one I miss most is my mind

Its like a fart in a windstorm
It smells good but thats about it

Registered Six Offender
Home of the Buzzin Half Dozen
rjbruzan is offline   Reply With Quote
Unread 11-03-2013, 12:42 AM   #5
Evildriver-3
Registered User
1995 ZJ 
 
Join Date: Mar 2005
Location: , Suffolk, NY
Posts: 922
Check your rzeppa at the front shaft
__________________
1995 Jeep gc ltd, 2005 Jeep gc ltd , 71 Dart, 73 RR 440-6pk, 78 Mag GT, 85 Power Ram W-350, 92 Daytona, 99 Dakota, 08 Ram 2500

Less than 8 is like playing with half a deck
]=Supershafts=[
Long Island Motorsports Association
Evildriver-3 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.