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-   -   2003 Liberty makes humming noise and vibration during deceleration (http://www.jeepforum.com/forum/f19/2003-liberty-makes-humming-noise-vibration-during-deceleration-1718322/)

bhawkins1978 10-24-2013 09:48 AM

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?

LJameson 10-27-2013 12:36 AM

Could be the upper control arm bushings are bad, causing the driveline angle to be off when you decelerate.

JohnCrabtree 10-30-2013 01:07 AM

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.

rjbruzan 11-02-2013 06:14 PM

The reason it hums is it doesnt know the words.

Evildriver-3 11-03-2013 12:42 AM

Check your rzeppa at the front shaft


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