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SUVs Jeep Cherokee and Jeep Grand Cherokee Jeep Grand Cherokee Vibration
188 messages, Last post on Jul 30, 2009 at 12:30 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee Forum. Your Hosts are steve_ & tidester
| Had a 2005 Jeep GC 4x4 Limited w/o a Hemi and turned it in and leased another 2008 JGC 4x4 Limited w/ a Hemi at the very end of last year.Started noticing a vibration at between 70-75 MPH I had never experienced before. I went through some of the same repair items here - balance the tires first, then blame it on the skid plate under the transmission. Finally, after a third time at the dealer, they mention its the MDS feature. When only 4 cylinders are running, a "harmonic change" in engine operation is introduced and this causes the vibration (however, it seems odd that only 4 cylinders would be running when I believe I am accelerating). The Chrysler tech rep. said this is within normal operating parameters, but its not acceptable to me and I'm starting to think the "L" word. Has anyone else been given this explanation? Has anyone gotten Chrysler to take it back based on this problem? If I don't get relief, I will never buy another Chrysler product again and this is my 4th Jeep! | |
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Replying to: rkbintx (Mar 12, 2008 8:21 pm) My car is currently at repair service with vibrations 40Hz (2400 rpm) at 75mph. If that is not successful, I am gonna ask them what are allowed quality tolerances for balanced shaft and I will then take car for shaft measurement and balancing to independent company. J.
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The problem you are ALL experiencing is a result a large quantity of "bad" driveshatfs that were installed on our Jeeps by the factory. I have/had the same problem. CHANGE YOUR DRIVESHAFTS! YES, THERE ARE TWO! Alan
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Replying to: wholelottahemi (Mar 13, 2008 4:32 pm) |
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You have to go to a dealer who will call into "Star' which is Chryslers bullshit tech line . This is where the mechanics get their help when they stuck on something. Chrysler knows about the problem and they are blaiming the driveshafts (front and rear). How do I know this? READ! I have the same car and the same problem and it has been an issue on my car since day one. I ruled out my tires and weights and isolated the problem to drivetrain. How? It only happens at certain speeds. They replaced the rear driveshaft and that helped a lot but the problem was still there. Then I brought the car back and said it's close but no cigar. Then they called "Star" again and they recommended replacing the front driveshaft as well. That got me to 90% which is the best you will ever get so I am living with it as it is only noticiable because I have been aware of a problem in drivetrain shudder between 70 and 75MPH since I bought the car. Now, I have constant check engine lights coming on that I am dealing with. I love the car but the quality control scares me. Alan |
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Just to give you some insight from a technicians perspective....yes, there is a vibration on "rkbintx" vehicle (I am the tech working on it) but there is much more that goes on behind the scenes that is written here. (1) It's a 21Hz "vibration" at 72mph that i've found (40Hz is out of the driveline range) (2) It's been a process of elimination with this vehicle - transfer case shield (yes, they vibrate), MDS, other body harmonics, exhaust, etc. (3) Yes, when the MDS turns on, you can feel (and sometimes hear) it. You can feel the surging if you really pay attention. Turning off 4 cylinders WILL cause a change in engine harmonics - there's just no way around that. (4) Under warranty guidelines, we can't install export driveshafts under an older model TSB that doesn't apply to the vehicle being worked on (Chrysler would just reject the claim and all h*ll breaks loose at the dealership for us) (5) Star is sometimes of no use to us unless you get a well seasoned "veteran" on the phone (6) We can't just throw parts at a vehicle in an attempt to fix it. (7) It's bothering me as well that I can't get a clear answer on what it is and have to take all of these steps to figure it out. However, this forum gave me some better direction with the export TSB post. With that said....the rear driveshaft part number on the export (2005) WK models is the same up to 2008 models. There is only one revision on it since the TSB came out. So...i've ordered the rear shaft to find out what the difference is and to find out if this actually fixes it or not. Will this fix the issue on all Jeeps in question - there's just too many variables to say yes or no - weight, load, road conditions, tire size/make/model, driveline configuration...they all come into play one can't say for sure that "all" have the same vibration unless you know that all the ones making this vibration are physically the same. |
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Dear Fasstdak, I respsect the fact that you are a technician and I am not. However, It was pretty easy to isolate the problem to the drivetrain for me. In fact, when all was said and done I found out that Star was recommending driveshaft swapouts for the problem. That was interesting because I felt the problem was in this area the entire time. After the rear driveshaft was replaced, there was about a 50% improvement. I took the vehicle back and said close but no cigar. I suggested they change the front driveshaft as well being that there are two driveshafts on the vehicle. Turns out I had to wait over a month to get a front drivesaft because they were on national back order! Coincidental? I doubt it. When my front driveshaft finally came in and got replaced, the improvment went up by about 40% giving me a grand total of 90% improvement. The saddest part to this blog is that people have to research and surf the internet for answers and help because Chrysler won't acknowledge the problem even though they are aware of it and feel that leaving the lot after paying 43K for a new truck with a shuddering vibration should be acceptable. Alan
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Replying to: wholelottahemi (Mar 19, 2008 6:09 pm) |
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As both posts put it very well...two similar vehicle with a very similar issue - two different "fixes" - one was tires and the other driveshafts. So here is exactly why replacing parts or pointing fingers at one specific part (as was noted on several posts) is not always the correct path to repairing an issue. As technicians, we not only play "doctor" on these vehicles, but also detective, engineer (sometimes reverse engineering something to find the issue), and even scapegoats for corporate "issues". |
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Hello! I agree with fasstdak - I measured noise and made a spectral analysis and came to 40Hz as well. My Chrysler service (Europe) says the policy is to balance the shaft first, so I am waiting for results. I asked for weight measurement records before and after balancing to see the change. The repair service also raised the wehicle and checked for vibrations while vehicle was up. They confirmed vibrations - means involvement of tires, road and wind were eliminated.
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