Question about 1999 Jeep Cherokee

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Jeep bucking or jerking at highway speeds

Recently, my jeep started to do this weird jerking/bucking motion when recovering from a dip in the road at highway speeds (40-55) -There is no loss or gain of rpm when this happens either. Almost like something may be binding and it doesn't do it every single time. It only seems to do it when most of the weight of the vehicle is off the rear end after a dip or bump in the road. I can also reproduce it by making hard right turns such as an off ramp/on ramp exit.
It does not seem to do it during left turns, only straight on or right turns that involve some part of the road that makes the right rear vehicle weight lighter.
Otherwise, it drives like new. It shifts smoothly, normal acceleration, checked the 4wd and works smooth - no binding, and has no check engine light. It just occurs when weight is slightly off the right rear and I see nothing broken underneath (with my novice observations). There are no fluid leaks anywhere, and fluids are in good condition. It's making me crazy. I want to solve and repair it on my own, but having trouble pinpointing the issue. Just wanted to see if anyone has ever experienced this issue. I was thinking maybe the throttle position sensor? I read that it can control transmission torque lock. Thanks for reading.

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Uh oh. It sounds like you have the all too infamous "Jeep Death Wobble" Google what I just quoted and you'll find pages and pages talking about it. It is a major problem with those older Jeeps. No one really seems to know exactly what causes it. But the fix is always the same. Get rid of the Jeep and get another vehicle. No Jeeps before 2001 unless you want to take the chance of ending up in the same situation.

Posted on Jun 05, 2010

  • ddorders22 Jun 05, 2010

    My issue doesn't do that at all. Steering isn't affected and there aren't any shakes going on.
    It's just a few really quick jerks. It's an automatic, but it feels like it would on a manual transmission if you were to press and release the clutch in fast succession as you were accelerating (best I can describe it), only mine does that forward to back bucking/jerking while holding a constant highway speed and turning right onto an offramp. Sometimes it does nothing at all and acts like normal, but the main thing each occasion has in common is a turn, veering to the right, or something that shifts vehicle weight left to the drivers side. As soon as the vehicle is straightened out , it resumes normal behavior. I have several shops nearby, but I love this Jeep and love working on them, but this just has me stumped.

  • Chad Conroy
    Chad Conroy Jun 05, 2010

    Hmmm. If it is an AWD model then I would check the condition of the front cv axles or u-joints depending on which front end it has. It could be that one is binding up when turned. Set the parking brake put it in neutral jack up the front and then spin the wheel by hand with them pointing straight then turn the wheels to the right and spin them again and see if you feel any binding. Other than that without being hands on with the jeep I really don't know what direction to point you in. I'll do some searches and see what i find.

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and see what codes are stored, DURING the buck.
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http://www.fixkick.com/Jeeps/ASD.html



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