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  #25  
Old 04-28-2012, 12:48 PM
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Question Re: Pentastar vibration at 2000 rpm/60 mph

I have posted the following and was referring to your post which seems to be quite the same what Im experiencing.
i have a strange hum sound (sine wave sound)
coming from the motor when slowly acceleration over 60 mph. about 1 cycle in 1 second.
it dissapears after releasing the gas pedal.
on GC 2011 Laredo X 70 anni. 3.6L. ~10K miles.

Is this what you described ? Did you find out the reason and solved it ?
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  #26  
Old 05-14-2012, 10:40 AM
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Re: Pentastar vibration at 2000 rpm/60 mph

I am experiencing almost the exact same thing here. At around 2000 or so RPM and 60 mph while going uphill I get a pulsing sound/vibration from the front left ish side of the car. Anyone have any update here as to possible causes and solutions? I have a new 12 limited w/ 18'' wheels. Thanks.
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  #27  
Old 05-14-2012, 01:49 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

Just bought my Jeep Grand Cherokee a month ago and have the same issue. Noticed it a few days after I bought it. I called the service dept and they seem to be aware of the issue but had no solutions. Can make it happen when going up small upgrade while accelerating to around 2100 rpm at 60 mph. Is also a pulsating type sound. Have contacted Chrysler at the link provided from one of the other posts. Definately not a tire issue. After paying 40k for a vehicle not satisfied with it being a "normal" symptom of the engine/transmission. Have a new 2012 limited with 18'' wheels
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  #28  
Old 05-15-2012, 09:57 AM
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Mine has a high pitched, very slight whine at exactly 61 mph. You have to turn the radio and AC off to hear it.


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  #29  
Old 05-17-2012, 03:24 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

I have the same noise. It seems like all the same complaints about this condition are with the V6 engine..
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  #30  
Old 06-01-2012, 02:02 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

Everyone that has this issue should notify Chrysler and get them moving on this issue:

http://www.jeep.com/webselfservice/j...m%28%27R%27%29
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  #31  
Old 06-01-2012, 02:39 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

do you guys notice this if you coast in "N" at the same speeds or is it clearly under load and around 2k RPMs?


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Old 06-07-2012, 01:28 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

Quote:
Originally Posted by ajs800 View Post
do you guys notice this if you coast in "N" at the same speeds or is it clearly under load and around 2k RPMs?


'
Mine only ocurrs during ligh acceleration. Found that I can get it to stop is I manually change it to a lower gear or take my foot off the accerator all together.
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Old 06-14-2012, 05:56 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

I have the same thing. Under load/acceleration going up a grade. It down shifts and it is pulsating rhythmic type vibration. Mine is worst about 2,300-2,500 rpm. Feels like a motor mount issue as it is directly related to engine load and rpm. I have an 11 with 18" Michelin's. Very annoying on a $37k vehicle.
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Old 06-20-2012, 01:05 PM
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Re: Pentastar vibration at 2000 rpm/60 mph

We have a 2012 JGC Overland V6 4wd, we noticed a whineing or slight hum
when acclerating at hwy speeds (60+mph). We took our JGC in, a tech went for a drive w/ me, he heard the noise then did some reseach. He informed me that they would needed to replace the front drive shaft. When the part came in the dealership swapped out the front drive shaft, the noise does not seem to exist any more.
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Old 06-21-2012, 09:58 AM
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Re: Pentastar vibration at 2000 rpm/60 mph

Strange, seems like the driveshaft would have to be out of balance if it was the cause of the noise.
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  #36  
Old 06-29-2012, 12:19 PM
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Angry Re: Pentastar vibration at 2000 rpm/60 mph

Have anyone succedded to solve the annoying vibration sounds?
Please share this with me, I am lost.
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