Vibration under power, no vibration when coasting -
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post #1 of 8 Old 06-28-2010, 08:53 AM Thread Starter
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2002 KJ Liberty 
Join Date: Sep 2007
Location: upstate ny
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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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post #2 of 8 Old 06-28-2010, 03:18 PM
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1984 CJ7 
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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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post #3 of 8 Old 06-28-2010, 04:52 PM
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sounds like u-joints
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post #4 of 8 Old 06-29-2010, 08:47 AM Thread Starter
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2002 KJ Liberty 
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Location: upstate ny
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It is an automatic, how do troubleshoot to figure out the cause, or rule out components?
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post #5 of 8 Old 06-29-2010, 09:31 AM
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My driveline guy says the drivelines in Liberty's suck. So you may be on the right track.

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post #6 of 8 Old 06-29-2010, 01:27 PM
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2001 TJ Wrangler 
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Originally Posted by bruteboy View Post
sounds like u-joints
I had this problem before.

01TJ33sWarn,ARBs F&R,bellyup,4.0,4.56s,5spd
99 XJ33sWinch,Electric locker up front,4.56s,4.0Auto
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post #7 of 8 Old 06-29-2010, 01:43 PM
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x2 on U-joints/ Centering Ball
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post #8 of 8 Old 02-12-2015, 05:53 PM
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Jeep Vibration under power

I bought my 94 jeep grand cherokee. The guy sold it cause it had a bad vibration under power. Anywhere from about 15 mph and up. Read all these forum. Got my brain rattling. I bought a can of sea foam. Put it in the take and put 25 bucks High octane gas. I have heard some vehicles will only run on high octane gas but never owned one. I've had several jeeps and never had to run high octane gas in them. Pulled out from the gas station and my jeep run great. Try running High octane gas. It fixed my problem . It was a very simple fix. I really don't think the sea foam had anything to do with fixing my problem. I think it was simply putting high octane gas in it. The sea foam wouldn't have immediatly fixed the problem.
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vibes when on gas , no vibes when coasting , vibrations , vibration , driveline vibes , driveline vibrations

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