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Unread 06-28-2010, 09:53 AM   #1
rwc77
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2002 KJ Liberty 
 
Join Date: Sep 2007
Location: upstate ny
Posts: 6
Vibration under power, no vibration when coasting

Last winter vibration started on totally stock KJ. It occurs when over aprox 38 mph and only under throttle, let off the throttle, no vibration.

It seems to be getting worse over time and I'm going to deal with it now that I have some time, but need some help with troubleshooting. I've read a lot of postings on here about vibration causes and feel it probably is drivetrain related.

I plan to:

1) jack vehicle up and put in drive, check for any obvious causes,
CV joint, driveshafts, etc

2) if nothing obvious, plan to pull rear driveshaft and drive with it disconnected, see if thats it, if not try front driveshaft

do these seem like reasonable steps ?
appreciate any suggestions on what to look for, how to pinpoint cause, etc


This is a 02 V6 4wd Liberty Sport with aprox 118k miles

Does the fact that vibration occurs under power and never when coasting
rule out non driveline causes like wheels, tires, front end issues, etc

had a friend say it was balljoints or wheelbearings, but I can't picture how
it would cause vibration only when your putting in throttle ?

vibration can be felt in wheel, seat, heard in dash, etc almost sounds like
a harmomic hum when throttle is added , even lightly

appreciate any insight on possible causes, and especially troubleshooting steps

thanks, rc

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Unread 06-28-2010, 04:18 PM   #2
scrapman
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1984 CJ7 
 
Join Date: Apr 2010
Location: Tyler, TX
Posts: 704
You didn't state if it was auto or standard. If it is auto, it sounds exactly like a problem I once had with a torque converter. It would vibrate only under power, never when coasting. Might be something to check.
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Unread 06-28-2010, 05:52 PM   #3
bruteboy
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Join Date: May 2010
Location: british columbia ca
Posts: 484
sounds like u-joints
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Unread 06-29-2010, 09:47 AM   #4
rwc77
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2002 KJ Liberty 
 
Join Date: Sep 2007
Location: upstate ny
Posts: 6
It is an automatic, how do troubleshoot to figure out the cause, or rule out components?
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Unread 06-29-2010, 10:31 AM   #5
KMD
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1976 CJ7 
 
Join Date: Apr 2009
Location: Modesto, California
Posts: 1,284
My driveline guy says the drivelines in Liberty's suck. So you may be on the right track.
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Unread 06-29-2010, 02:27 PM   #6
Ross
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2001 TJ Wrangler 
 
Join Date: Dec 2002
Location: BUM****, MO
Posts: 10,533
Quote:
Originally Posted by bruteboy View Post
sounds like u-joints
I had this problem before.
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Schitzangiggles: We used to teach our children to fight evil, now we teach them that fighting is evil.

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"If you aim at nothing, you will hit it every time." Zig Ziglar
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Unread 06-29-2010, 02:43 PM   #7
ClimbStuff
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2003 TJ Wrangler 
 
Join Date: Aug 2009
Location: Trinidad, Colorado
Posts: 1,229
x2 on U-joints/ Centering Ball
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vibes when on gas , no vibes when coasting , vibrations , vibration , driveline vibes , driveline vibrations

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