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  #85  
Old 11-05-2013, 07:19 PM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by BRETHOKKANEN View Post
I too went thru all this on my 2014 Overland. I put on a set of Bridgestone tires and the steering wheel is rock solid...........
hey what bridgestones did you get? I was thinking of those also and dropping the forteras
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  #86  
Old 11-09-2013, 05:19 PM
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Re: Vibration in the 2014 grand cherokee summit

Hey everyone - first post. I found my way here searching for answers, as many of you have. Thought I would share my experience thus far. 2014 Limited. Around 1000kms I took it to the dealer and described the shimmy in the wheel, and also a shake throughout the rest of the vehicle. They re-balanced and said the problem was fixed. It wasn't.

Took it back and they said it was due to a flash update for the transmission. Did it, and they said the problem was fixed. It wasn't.

I called and explained it was still the same. They told me they would take it for however long it would take to fix. Took it back and they kept it for 4 days. I had ordered my winter tires in the meantime, and after reading the posts here, told them to throw those on and see if it was the Forteras. Winter Hankooks on, problem still the same.

My dealership does not have a road force balancer. They have told me they have no idea what the problem is. They have acknowleged there is an issue, and are aware of two other Jeeps on their lot that have the same problem. I have an open case with Chrysler Customer Care, and they basically just tell me to bring it to the dealership. For now, I'm impatiently dealing with the vibration.
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  #87  
Old 11-12-2013, 05:37 PM
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Re: Vibration in the 2014 grand cherokee summit

After reading 8 pages of issues on shimmy I am getting gun shy ordering one since I am planning on the Overland with 20".

One thing to note that I have not seen in ANY of these posts. That is how tight the backlash adjustment is set. I learned from the Subaru Outback site that this was a problem in their Gen 4 Outback. Solution was to tighten the backlash to a much higher force and the problem is solved.
I didn't like the heavy steering in the Outback and frankly the test drive in the 14 Limited with diesel the steering was clearly overboosted.

Has anyone discussed increasing backlash as a solution to dampen the shimmy?
Just a thought.
I hope they solve this because this Overland would be 50 large and I would be living with a PO'ed wife too...
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  #88  
Old 11-12-2013, 05:42 PM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by fun2drive View Post
After reading 8 pages of issues on shimmy I am getting gun shy ordering one since I am planning on the Overland with 20".

One thing to note that I have not seen in ANY of these posts. That is how tight the backlash adjustment is set. I learned from the Subaru Outback site that this was a problem in their Gen 4 Outback. Solution was to tighten the backlash to a much higher force and the problem is solved.
I didn't like the heavy steering in the Outback and frankly the test drive in the 14 Limited with diesel the steering was clearly overboosted.

Has anyone discussed increasing backlash as a solution to dampen the shimmy?
Just a thought.
I hope they solve this because this Overland would be 50 large and I would be living with a PO'ed wife too...
Backlash for what? Drive train? Steering?
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  #89  
Old 11-12-2013, 07:38 PM
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Re: Vibration in the 2014 grand cherokee summit

Quote:
Originally Posted by fun2drive View Post
One thing to note that I have not seen in ANY of these posts. That is how tight the backlash adjustment is set. I learned from the Subaru Outback site that this was a problem in their Gen 4 Outback. Solution was to tighten the backlash to a much higher force and the problem is solved.
I assume you're referring to the backlash at the rack and pinion (the gear mesh). In steering gears this is generally referred to as a preload adjustment. Toyota had a similar situation with their 2003-2005 4Runners being extremely sensitive to tires and "shimmy." Their solution was to increase the gear preload to "tighten" it up a bit. The feel of the steering changed as a result...it felt a bit stiffer with more turning resistance. In 2006 all new gears in new builds had the increased preload setting.

Quote:
I didn't like the heavy steering in the Outback and frankly the test drive in the 14 Limited with diesel the steering was clearly overboosted.
Well the steering systems on the diesel and the 3.6L are pretty much the same (both electro-hydraulic, and I believe they both use the same rack--though I believe 4x4 and 4x2 have different racks, but the same between diesel and 3.6L). So, unless you're getting the Hemi (5.7L), you're likely going to feel that "overboost" to the steering. Personally, I've found the electro-hydraulic setup does feel a tad bit overboosted, and the straight hydraulic setup on the 5.7L feels a bit "heavier"--though that could be the difference in the steering gears, and not necessarily the actual amount of boost.

Quote:
Has anyone discussed increasing backlash as a solution to dampen the shimmy?
Just a thought.
Well, the preload might be related to why the steering is so sensitive to tire imbalance and runout, but the root cause is likely said issues. The vehicle is just really sensitive to it and there a probably a lot of factors at play causing the sensitivity.

In fact, my favorite tire place and I went through all this solving it on mine. As it turned out, I had one tire with 29lbs road force, and the other 3 were all under 15. Indexing the tires on the wheels gave me 3 with road force under 10lbs (5, 3, and 8) and the bad tire got down to 20. Put that bad tire on the passenger side rear and the 5 and 3lb ones up front, no shimmy. At ALL. Did a little playing around and basically to eliminate the shimmy you have to aim for the front two tires with road force variations UNDER 10lbs (5 or less is fantastic). In addition, the two front tires should vary less than 5lbs between each.

So, for a truck, yes...this is VERY sensitive.

The steering gear preload wouldn't really be a long-term solution as it will loosen up over time as the gear wears. It wouldn't surprise me though if Chrysler did what Toyota did and perhaps come out with a bulletin to increase the preload a bit though (if they went this route though they MIGHT just do a gear swap as playing with the gear preload is rather time-consuming and can really result in crappy steering feel if not done right).
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  #90  
Old 11-12-2013, 11:46 PM
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Re: Vibration in the 2014 grand cherokee summit

What are your thoughts on the vibration only occurring 2/3 of the time? Sometimes I can drive the thing and it's as if nothing is wrong. It's rare that it's ok, but it does happen.
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  #91  
Old 11-13-2013, 01:05 AM
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Likely pressure variation due to different temperatures. Different pressures (even a 1-3psi difference) can change the road force just enough to make it less or more noticeable. Possible evening out a difference between left and right front tires enough to lessen the shimmy effect.

Ever had two front tires out of balance or out-of round but yet sometimes it felt not so bad as you were driving on the highway? Then you went on a curve and it got worse again? The imbalance was in phase for a bit, so the wheel wasn't shimmying...but when you took the curve the wheels traveled at different speeds so they went out of phase again and the shimmying started all over.

Even yet another possibility is if the vehicle sits for a bit and flat-spots the high part of a tire with runout it will feel better for a while...until the tire warms up and regains its (out-of-round) shape.

Lots of variables here...
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Old 11-13-2013, 10:17 AM
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Re: Vibration in the 2014 grand cherokee summit

My Limited is back at the dealership today for the vibration/shimmy. This is visit #3 to try and resolve this. They stated they are going to do 3 things, to start:
- Roadforce balance tires
- Swap the tires/rims (if needed)
- Flash software

If those don't correct it, they are going to contact me with next steps such as evaluating the drive train.
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Old 11-13-2013, 01:45 PM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by chinny12 View Post
My Limited is back at the dealership today for the vibration/shimmy. This is visit #3 to try and resolve this. They stated they are going to do 3 things, to start:
- Roadforce balance tires
- Swap the tires/rims (if needed)
- Flash software

If those don't correct it, they are going to contact me with next steps such as evaluating the drive train.

Good luck. Let us know what the outcome is! My dealership doesn't have a Road Force balancer. If this works for you, I'll have them track one down.
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  #94  
Old 11-14-2013, 10:03 AM
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Re: Vibration in the 2014 grand cherokee summit

No bueno!

They performed the following work to the car:
- Re-balanced the tires
- Swapped the rims & tires (non Goodyear tires on that one) with a set from a new Jeep Grand Cherokee in the lot
- Inspected the drive shaft and other miscellaneous mechanical parts for visible defects

After all that, the issue still exists. The Service Manager now has a call into the Techline seeking a resolution for this. Personally, I'm expecting nothing will come of it.

I'll continue to update as I get additional info.
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Old 11-14-2013, 11:45 AM
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Is the vibration you are experiencing a side-to-side "shimmy" of the steering wheel?
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  #96  
Old 11-14-2013, 11:50 AM
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Re: Vibration in the 2014 grand cherokee summit

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Originally Posted by Peter_K View Post
Is the vibration you are experiencing a side-to-side "shimmy" of the steering wheel?
I feel and see it in the steering wheel. However, you can a vibration in the seats, floor, etc. all over the car as well.
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