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  #61  
Old 09-30-2013, 07:52 AM
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Re: Vibration in the 2014 grand cherokee summit

Hi Shewstring , the vehicle I am getting is identical to the one I have . I hope I am as successful as you with getting one that doesn't have any problems. I am going to call ISG today to confirm the order has been processed and in the system . The dealer placed the order last Thursday .
The vibration is really bad right now after the last tire balance , over 60 mph and everything vibrates.
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  #62  
Old 10-28-2013, 12:10 PM
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Re: Vibration in the 2014 grand cherokee summit

On third visit, the dealer kept my Overland a week with Chrysler tech guy on board. I thought the problem was the 20" Forteras, but they tell me it is the steering column with no current fix. 2014's do not have the previous Benz-made column, and an older one won't fit the 2014. All agree there is an issue, but I am not encouraged a fix is forthcoming any time soon.
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  #63  
Old 10-28-2013, 12:32 PM
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Re: Vibration in the 2014 grand cherokee summit

Quote:
Originally Posted by rmd1 View Post
On third visit, the dealer kept my Overland a week with Chrysler tech guy on board. I thought the problem was the 20" Forteras, but they tell me it is the steering column with no current fix. 2014's do not have the previous Benz-made column, and an older one won't fit the 2014. All agree there is an issue, but I am not encouraged a fix is forthcoming any time soon.
Hi RMD , I am not convinced it is the steering column , the vibration has to be caused by an item that is either oscillating , out of round or bent. I don't see how a column could cause that . The column is directly connected to the rack .
Be persistent about the issue . Have you contacted Chrysler?
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Old 10-28-2013, 12:52 PM
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Quote:
Originally Posted by bobh View Post
Hi RMD , I am not convinced it is the steering column , the vibration has to be caused by an item that is either oscillating , out of round or bent. I don't see how a column could cause that . The column is directly connected to the rack . Be persistent about the issue . Have you contacted Chrysler?
Actually the column is directly connected to the rack via a u-jointed shaft and a coupler. However, I do agree that this isn't an issue with the column. The "shimmy" or side-to-side movement of the wheel is simply a feedback from actual forces generated at the wheels and suspension. The column itself is simply a jointed and telescoping shaft with a steering wheel attached and of itself can't cause an oscillation like that.

All that said--here are some things along those lines that can contribute:

1) Too little mass in the steering wheel. Larger mass will dampen an oscillation to a degree. With too little mass, small oscillations can easily be transmitted.

2) Too little friction in the steering. This can be from the linkage, all the way up to the column and is cumulative. If it moves TOO freely, again--small oscillations will transmit more freely.

3) Too little hydraulic damping in the rack, either allowing oscillations to transmit freely or, the valving is actually allowing oscillations to be amplified. I have seen that before...but not on a modern rack of recent times.

4) Suspension tuning allowing resonant frequencies at the same point where they occur naturally with the wheels and tires having their highest amplitude.

5) Bad tires or poorly trained/disinterested people balancing them.

4) A combination of all the above.

Although I've been saying I suspected tires all along, I'm starting to think 3 and 4 above are having more merit.
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Old 10-28-2013, 03:52 PM
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Re: Vibration in the 2014 grand cherokee summit

Quote:
Originally Posted by Peter_K View Post
Actually the column is directly connected to the rack via a u-jointed shaft and a coupler. However, I do agree that this isn't an issue with the column. The "shimmy" or side-to-side movement of the wheel is simply a feedback from actual forces generated at the wheels and suspension. The column itself is simply a jointed and telescoping shaft with a steering wheel attached and of itself can't cause an oscillation like that.

All that said--here are some things along those lines that can contribute:

1) Too little mass in the steering wheel. Larger mass will dampen an oscillation to a degree. With too little mass, small oscillations can easily be transmitted.

2) Too little friction in the steering. This can be from the linkage, all the way up to the column and is cumulative. If it moves TOO freely, again--small oscillations will transmit more freely.

3) Too little hydraulic damping in the rack, either allowing oscillations to transmit freely or, the valving is actually allowing oscillations to be amplified. I have seen that before...but not on a modern rack of recent times.

4) Suspension tuning allowing resonant frequencies at the same point where they occur naturally with the wheels and tires having their highest amplitude.

5) Bad tires or poorly trained/disinterested people balancing them.

4) A combination of all the above.

Although I've been saying I suspected tires all along, I'm starting to think 3 and 4 above are having more merit.
I actually disconnected the electric hydraulic power steering motor to see if it was related to the hrdraulic pressure from the pump through the rack and it didn't change a thing

I dial indicated every rotating part including rims . I feel it is a combination of suspension and tire balance , when tires are slightly off balance with whatever is going on with the suspension the vibration occurs .

The biggest influence on vibration was changing and balancing tires . It is only as good as the equipment and the technician .

Has anybody experienced front end noise when going over speed bumps?
It actually sounds as if the springs are moving on the strut .
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Old 10-28-2013, 08:19 PM
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Re: Vibration in the 2014 grand cherokee summit

There was a suggestion that the newer steering column was not as robust as the earlier one. I tend to agree that the suspension should better damp the scillation at the source. For what it is worth, I noticed recently that when the ambient temp dropped below 50 and tire pressures dropped from 36 to 33 psi, there was considerably less vibration at the critical number for me, 64 mph. There has also been noticeable bump steering in the car, although I can't nail down specific conditions. For example, the steering wheel was hopping all over the place when going over a gravel parking lot a few weeks ago, ditto over certain kinds of potholes.
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Old 10-29-2013, 06:58 AM
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Re: Vibration in the 2014 grand cherokee summit

Quote:
Originally Posted by rmd1 View Post
There was a suggestion that the newer steering column was not as robust as the earlier one. I tend to agree that the suspension should better damp the scillation at the source. For what it is worth, I noticed recently that when the ambient temp dropped below 50 and tire pressures dropped from 36 to 33 psi, there was considerably less vibration at the critical number for me, 64 mph. There has also been noticeable bump steering in the car, although I can't nail down specific conditions. For example, the steering wheel was hopping all over the place when going over a gravel parking lot a few weeks ago, ditto over certain kinds of potholes.
The steering column may not be the same but it is not the root of the problem . I really think that there are a couple of issues and when combined the end result is vibration . Mine also has a lot of the bump steer .
Has the dealer had a input of value?
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Old 10-30-2013, 09:52 AM
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Re: Vibration in the 2014 grand cherokee summit

The dealer apparently got resistance from Chrysler about replacing tires under warranty, and then involved the factory tech rep for the area. The rep did some hands on work with the car and concluded it was the steering column. I assume this was coming from on high as well as with working with other cases in the area. I do not know if I am a STAR case. The dealer has been sympathetic and mostly helpful. I'm scheduling another visit next week for this and other purposes.
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Old 10-30-2013, 09:58 AM
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Re: Vibration in the 2014 grand cherokee summit

Quote:
Originally Posted by rmd1 View Post
The dealer apparently got resistance from Chrysler about replacing tires under warranty, and then involved the factory tech rep for the area. The rep did some hands on work with the car and concluded it was the steering column. I assume this was coming from on high as well as with working with other cases in the area. I do not know if I am a STAR case. The dealer has been sympathetic and mostly helpful. I'm scheduling another visit next week for this and other purposes.
Have you called Chrysler , they have a consumer number to call and you can open a file from your end . They will actually call dealer while you are on the phone with them to verify
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Old 10-30-2013, 10:00 AM
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Re: Vibration in the 2014 grand cherokee summit

The dealer apparently got resistance from Chrysler about replacing tires under warranty, and then involved the factory tech rep for the area. The rep did some hands on work with the car and concluded it was the steering column. I assume this was coming from on high as well as with working with other cases in the area. I do not know if I am a STAR case. The dealer has been sympathetic and mostly helpful. I'm scheduling another visit next week for this and other purposes.
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Old 10-30-2013, 11:10 AM
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Re: Vibration in the 2014 grand cherokee summit

Contacted Customer Care, got case manager assigned...
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Old 11-02-2013, 07:36 PM
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Re: Vibration in the 2014 grand cherokee summit

Hi, I'm new to the GC. Picked up a 14 Overland, V-6, 4x4 w/OR pkg two weeks ago. The first time I drove it on the highway (it was located and the test drive was around the block, non-highway) the steering shimmied severely at 66 mph. As I troubleshot the issue over the last week it seemed to be confined to around 61-71 mph and is exacerbated by off-camber highways and when the surface changes (concrete to asphalt/groove to non-groove/general bumps). I made an appointment with the dealer for this morning, dropped off the car and was called after 20'! The mechanic had taken the car for a ride, verified the shimmy, and said there was nothing they could do. 'The problem is known by Chrysler, they are working on a fix, there is no fix yet. It is because of the telepathic steering and affects all 14s with power steering wheel adjustment.' I asked the service manager when I picked it up if I should call Chrysler and he said they'd send a post card when they have a fix. Seems sketchy. I plan to contact customer support at Chrysler and open one of these star cases. My Jeep was built in June. I am shocked that this sucker vibrates like it does. I love the car in every other way. Be a shame to lemon law it.
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