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  #1  
Old 05-23-2011, 11:15 AM
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highlandchef highlandchef is offline
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Default Odd Exhaust Noise

I've had my 2009 5.7 Hemi Crewcab for a week and a half now and I just took it on its first road trip for work, about 450 miles round trip. I noticed and odd noise that seems to come from the exhaust. Between about 1700 and 2000 RPM's the exhaust note seems to come from right under me and I can feel a slight vibration under foot. We're not talking extreme but there is definitely a resonance. As soon as the tach kicks over 2000 the resonance is gone and the exhaust note is back at the tailpipe. Unfortunately at certain highway speeds the engine seems to spend a lot of time in that range so it gets annoying after a while.

A little background. The truck is in great shape and seemed barely used when I got it (less than 11k on the odometer). The previous owner had swapped out the stock muffler for something that had more sound. Unfortunately that didn't work for me (wife didn't like it and it wouldn't be popular in my neighbourhood) Not to mention I use it for traveling and I didn't really want to listen to the extra noise all the time; sorry I'm getting old. Anyway, the dealer said they would change it as part of the deal and they did. Now I don't think they used a new muffler, but it seemed fine.

Also, I was towing a 6 x 12 trailer for my trip when I first noticed it; the trailer weighs in at less than 3000 lbs. so it's not testing the truck much at all. I didn't notice it before (I also wasn't on the highway much till this trip). So when I was unhitched and on the highway I listened for the noise and resonance. It's still there, just more noticeable when the truck is under load. I tried cruising with the Tow/Haul switch both on and off and it didn't make a difference. If the engine is in that RPM range the noise and the resonance is there.

So before I go to the dealer I figured I would ask if this is something normal that others encounter or if anyone has an idea what might be causing it so I'm a bit more informed when I'm talking to the Service Manager? Since they have changed the muffler already I'm expecting they are not going to jump at the chance to work on it again.

Thanks for the help
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Old 05-23-2011, 11:26 AM
saunders1986 saunders1986 is offline
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im thinking its the mds system, when that cuts in, you can feel a vibration, and the exhaust changes tone. this is normal.
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Old 05-23-2011, 11:50 AM
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Thanks for the reply; I'd read other threads about the MDS but I didn't think my issue was likely to be that. I thought the MDS didn't operate in the Tow/haul mode or when the engine was under load. I'm new to this so I may be wrong, also in my 2009 I can't tell when I'm in MDS so that makes it e en harder to know.
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Old 05-23-2011, 12:13 PM
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you said that you still heard it in tow/haul
so its not MDS, you can also shift down 1 time so that the 5 shows up on your EVIC, you won't be in MDS mode then either

I'm thinking that the exhaust is hitting the frame slightly, that noise will travel throughout the vehicle & you wouldn't be able to pin point it
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Old 05-23-2011, 12:14 PM
tbeaton tbeaton is offline
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mine hits a dead spot at those rpm's. i have a banks on my 2500 and it goes from loud to nothing it a split second.
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Old 05-23-2011, 05:04 PM
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Quote:
Originally Posted by GTyankee View Post
I'm thinking that the exhaust is hitting the frame slightly, that noise will travel throughout the vehicle & you wouldn't be able to pin point it
I wondered about that and it certainly seems the most logical answer, the only question is the noise isn't as loud when the truck isn't under load (towing in this case); it still happens at the same RPM range but not as loud. Would that make a difference?

Quote:
Originally Posted by tbeaton View Post
mine hits a dead spot at those rpm's. i have a banks on my 2500 and it goes from loud to nothing it a split second.
I don't feel a dead spot so much at those RPM's but the noise does build up, under load, then it just stops and its the regular rumble from the tailpipe by the time I hit 2000 PRM's, much quieter. Forgive me I don't know what a banks is though.
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Old 05-23-2011, 05:36 PM
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It's MDS. The only logical explanation. That, or your not used to a V8.
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Old 05-23-2011, 05:59 PM
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Quote:
Originally Posted by Juice420 View Post
It's MDS. The only logical explanation. That, or your not used to a V8.
Well since it happens at the same RPM range whether the truck is in Tow/Haul mode, when shifting manually or simply in Drive I thought that "logically" ruled out the MDS?

Other than to be insulting, I don't see how me being used to a V8 has anything to do with it (I am by the way and I've probably been driving them since before you were born)? I doubt an annoying noise or vibration that takes place in an RPM range common at highway speeds would be a planned design parameter.

Now if what you were trying to say is you have the same experience and you know it to be a common experience with these models then that is part of what I was asking, so thank you for your response.
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Old 05-26-2011, 08:49 PM
larryduffer larryduffer is offline
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Default Odd exhaust noise

There is a lot of evidence out there that it is probably the torque converter. See my thread on growling and grinding noise. I have a 2011 Big Horn with the 5.7 and I am getting these noises also and it is worse when under a load or going up a incline at certain speeds. I also think is is RPM related somehow. Chrysler does have a problem with the torque converter on some trucks. MY dealership is working with Chrysler now on the possibility of installing another torque converter to see if this solves the problem. Hope this helps you out some.
PS. The noise I am getting sounds something like a drive shaft rubbing on something a certain speed or RPMS.
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Old 09-24-2011, 07:13 PM
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Bringing this thread back to life. Curious to see if the issue was resolved or what the diagnosis was.
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