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Unread 09-21-2012, 09:04 PM   #1
ccw3432
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Join Date: Sep 2012
Location: Three Rivers, CA
Posts: 2
2012 Liberty bogging up hill

I have a 2012 Liberty that is experiencing an odd bogging or growling type sound that only happens under very specific conditions. I drove it up from 1000' feet elevation to around 4500' up a windy montain road. During the drive up hill going at about 20-25 mph the engine or drivetrain made a low pitch sound that just dosen't sound right. It's hard to describe. Sounds kind of like bogging down but maybe a litter louder than I would usually associate with that sound. It happened on two occasions now. When I lift my foot off the pedal or press the pedal down further it stops. If I hold the pedal where it is the sound continues.

It rarely happens so its hard to diagnose much furhter until next time I drive it up the hill. It did it on 2 of the 3 trips up this hill.

Any thoughts? We took it to the Jeep dealer and they said there was no probelem with the vehicle. Is this normal?

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Unread 09-22-2012, 10:23 AM   #2
pshivers
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2008 KK Liberty 
 
Join Date: Sep 2012
Location: Westerville, OH
Posts: 40
I'll see if I can find it in the service manual, but when you first turn the key to on, the computer figures out the barometric pressure. I don't know if it has the ability to resample once the car is running due to the vacuum created in the intake. Taking the car up to a thinner atmosphere might cause issues with its air/fuel ratio calculation as it would be expecting more air. Try restarting the jeep at the higher elevation.
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Unread 09-22-2012, 07:36 PM   #3
ccw3432
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Join Date: Sep 2012
Location: Three Rivers, CA
Posts: 2
Thanks for the reply. I actually shut it down about half way up the hill both times to stop at a construcition area. I'm not convinced the altitude is issue, but I really don't know. Thought it could be but also wonderning about the gear shifting or engine bogging due to a malfunction in shifting. It almost sounds like a low pitch groan.
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Unread 09-25-2012, 09:01 AM   #4
stv9000
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2011 KK Liberty 
 
Join Date: Jul 2012
Location: Clifton Park, New York
Posts: 22
It may be the transmission not shifting correctly. try putting it in tow.
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