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  #1  
Old 05-04-2012, 07:02 AM
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Humm in front end... Known problem but no solution according to Chrysler

2011 summit 4x4 hemi loaded. I have a vibration or a humm in the front end at interstate speeds. 70-80. Started around 10k. I have 34k on it now.

This is the third time the dealer has tried to fix the problem. I asked them to run it up the chain at Chrysler. Apparently they got the south east Chrysler tech guy in the phone and he is aware of the problem as this is a "known issue".

So I asked "what's the fix?" "there is no fix"... Says dealer.

So I tell them that's not acceptable and what are our next options. He said he needed to get in touch with the next guy up who is the regional manager, above mechanics. Guess he gets the business aspect of this situation, or is suppose to.

Does anyone have any suggestions on how to fix a "known problem" that has no apparent fix?
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Old 05-04-2012, 08:22 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Where's the sound coming from? The differential, the wheel bearings, the CV joints?
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Old 05-04-2012, 08:25 AM
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I'm not exactly sure. Sounds like near axle. Beyond that I'm clueless. Was hoping the dealership could identify.
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Old 05-04-2012, 08:43 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Do you have a helmet hero? Maybe you could tie it to the chassis somewhere pointed at the front differential and recreate the sound that way.

I know what differential noise sounds like but can't describe it. If that's what it is you might try changing out the fluid with Royal Purple. I've done that to RWD cars before with good success.
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Old 05-04-2012, 09:37 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Mine has done it from day one as well, but lately it doesn't seem as noticeable. I'm hoping it will fade with more miles. Sitting at 11k right now. I have yet to take mine back to the dealer for anything but plan to mention it once I do. I'll be watching your case closely.

It's very slimilar to road noise when going over an overpass or when running on grooved pavement, right? Mine comes and goes once i get above the 65-70 range.


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Old 05-04-2012, 09:54 AM
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You're correct. Just picked it up from dealership and requested email chain to Chrysler in case I have to get attorney involved. Driving at 75 now still there.
It gets worse with miles from my experience.
Guy said another one was in the shop for same reason.
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Old 05-04-2012, 09:58 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Does the sound change if you put it in sport mode? That would reduce the load on the front diff.
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Old 05-04-2012, 10:01 AM
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Negative on sport mode. Just tried it.
I believe on on the interstate the jeep reverts to aero mode even in sport. I feel it adjust once I get up to speed.
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Old 05-04-2012, 10:15 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Since dealerships are pretty much worthless I would keep trying stuff on your own to help isolate the problem.

A way to determine if its a wheel bearing is swerve left and right. If you notice the sound get louder or go away depending on which way you swerve can determine if its a wheel bearing issue or not.

A way to try and help eliminate driveline issues is mess around with different throttle applications. Does the sound get worse while the vehicle is accelerating? How about constant speed or deceleration? Is the sound constant and consistant regardless of power application?

While at cruising speed put the Jeep into neutral and see what happens with the sound.

The only other things I can think of would be an alignment, or possibly a bad tire. Maybe try throwing the front wheels on the back? Just an FYI I had a Lexus ES300 with a noise that sounded identical to a driveline or wheel bearing issue and it was literally all because of a defective tire. Its weird how a tire can replicate mechanical noises, but it very well can. I replaced the tires and the car was 100% quiet and smooth after that.

Hope this information helps you diagnose the issue.

P.S. For what its worth be very careful with the dealership. I had a dealership try and fix a noise on a previous Grand Cherokee and I ended up getting it back in worse shape than when I brought it in. So be sure thats what you want to do.

James
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Old 05-04-2012, 10:49 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

I have always thought it might be tire related but have yet to swap them out or around.

swerving multiple times - No change
Sport Mode - No Change
throw it in "N" while traveling at HWY speeds - No Change

Kaflyboy -- Did the dealer say what model of WK2 this other person had? I've often wondered if it's related to the QL. I think I remember a couple folks complaining of this without QL, but don't recall for sure.


You have the 20" wheels with GY tires, correct? I feel that this tire/wheels setup creates more road noise then normal when running grooved/uneven surfaces.




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Old 05-04-2012, 11:01 AM
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Re: Humm in front end... Known problem but no solution according to Chrysler

Quote:
Originally Posted by JTS97Z28 View Post
Since dealerships are pretty much worthless I would keep trying stuff on your own to help isolate the problem...
For something like this I agree. Most "remove and replace" instead of diagnose.

Quote:
Originally Posted by ajs800 View Post
...
throw it in "N" while traveling at HWY speeds - No Change
That means that it isn't the input side of the transmission. It could be the output side of the transmission on forward (transfer case, differential, CV joints, wheel bearings).
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Old 05-04-2012, 12:26 PM
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Yes have 20 with the Goodyear
Dealer said other problem was on 2012
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