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Odd vibration/rattle coming from under passenger seat

miles5241

Member
I noticed that when under 40mph and the MDS kicks in while putting load back on the motor just enough to keep it in 4 cylinders there is a rattle/vibration that occurs that almost sounds like a griding under the front passenger seat. Almost like a piece of metal rattling on the exhaust. I crawled under there but everything is pretty much covered. I'm bringing it in next week for the recalls and some other minor things. I'll let them know and I can replicate it every time. But just curious if anyone else has experienced this with their Hemi.
 

Jeepers22wl

New member
I just picked up my two row GC Hemi and am experiencing the same thing you describe, specifically in the 1300-1500 rpm range. Did you end up getting this resolved? If so, what was the cause?
 

miles5241

Member
I just picked up my two row GC Hemi and am experiencing the same thing you describe, specifically in the 1300-1500 rpm range. Did you end up getting this resolved? If so, what was the cause?
It goes in next Wednesday to address it. When I first brought it in they couldn't replicate it, went back and rode with the manager since I am able to replicate pretty consistently. It gave a great show for him. Also with that said I found it to be more consistent when its both warmer ambient temp outside, and everything is completely up to operating temp. Otherwise the MDS vibration doesn't exist, just that rattle.
 

miles5241

Member
To add a resolution to this. It was 2 things, first exhaust shield under the passengers side that was rattling against the bottom of the body. The second piece was a missing exhaust hanger bolt causing the entire exhaust system to flex more then it is supposed to creating the audible vibration. They addressed the issue and I'm convinced what i thought was feed back from the road was probably that issue as well. All is good now!
 
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