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Rattling Noise
- Thread starter Odimus
- Start date
rascole
Well-Known Member
- Messages
- 2,846
- Location
- Bellflower, CA
I5 or V8? The I5 has an aluminum heat shield over the exhaust that over time will rattle loose. Took me 6 months to find it and then I just pulled it all the way off and never heard it again.
Happy Hummer
Well-Known Member
- Messages
- 1,464
- Location
- Wisconsin
Agreed the heat shield on mine vibrates like a bi!ch.
- Messages
- 10,673
- Location
- Scottsdale
Hawk brings up a good point - if you have a vibration under acceleration you could have one or two bad motor mounts. The passenger one in particular is prone to tearing. Under acceleration the engine will move and get two surfaces to start hitting each other.
I had a combo rattle on mine.
The first was the heatshield which the dealer wants $850 to fix (some sort of ****ing vibration dampener).
The second was a horrible rattle when going into low speed turns, both directions.
I swear it sounded like a damn hub or diff going out.
Loud enough to make people look.
Interestingly enough, it started right after some recent dealer service.
I gave them truck back, which they had for 2 weeks to diag, only to blame the noise on the tires and wheels.
Said the noise went away completely when they put on regular factory tires and wheels.
I called bull**** and gave them back the Caddy CTS I had been driving for a loaner (which I absolutely ****ing loved BTW).
Get the ****er home, almost put my factory take-offs back on but decided to check the drivetrain one more time.
Get under the truck, look up and what the **** do I see……Yep, 2 god damned skid plate bolts with about ¼ inch of thread showing.
Bolts will not tighten up, guess they cross threaded them when putting the skid back on.
Dropped the skid, left it off completely, road tested and guess what?
Need to chase the threads and re-mount the skid….All should be good.
Apparently, when turning, the outside lugs on my 35’s created just enough vibration to rattle the **** out of that skid.
Needless to say, their street tires did not have that issue, so no noise.
That one made me mad at both the dealer AND myself.
At least that problem is all fixed now.
However, I cannot for the life of me figure out how to fix/remove that damn heat shield.
I can see it, can beat on it with a small hammer, pry on it, all sorts of ****…..It “seems” solid.
But no…..same damn vibration noise between 1k and 1.5k RPM.
Just suffering with it till the weather cools off a bit then will investigate further.
The first was the heatshield which the dealer wants $850 to fix (some sort of ****ing vibration dampener).
The second was a horrible rattle when going into low speed turns, both directions.
I swear it sounded like a damn hub or diff going out.
Loud enough to make people look.
Interestingly enough, it started right after some recent dealer service.
I gave them truck back, which they had for 2 weeks to diag, only to blame the noise on the tires and wheels.
Said the noise went away completely when they put on regular factory tires and wheels.
I called bull**** and gave them back the Caddy CTS I had been driving for a loaner (which I absolutely ****ing loved BTW).
Get the ****er home, almost put my factory take-offs back on but decided to check the drivetrain one more time.
Get under the truck, look up and what the **** do I see……Yep, 2 god damned skid plate bolts with about ¼ inch of thread showing.
Bolts will not tighten up, guess they cross threaded them when putting the skid back on.
Dropped the skid, left it off completely, road tested and guess what?
Need to chase the threads and re-mount the skid….All should be good.
Apparently, when turning, the outside lugs on my 35’s created just enough vibration to rattle the **** out of that skid.
Needless to say, their street tires did not have that issue, so no noise.
That one made me mad at both the dealer AND myself.
At least that problem is all fixed now.
However, I cannot for the life of me figure out how to fix/remove that damn heat shield.
I can see it, can beat on it with a small hammer, pry on it, all sorts of ****…..It “seems” solid.
But no…..same damn vibration noise between 1k and 1.5k RPM.
Just suffering with it till the weather cools off a bit then will investigate further.
Last edited:
jacobharris84
Active Member
- Messages
- 33
- Location
- Ohio, USA
Could be a worn crossmember bushing.
Both CV joints swapped out...same noise...noticed cross member bushing was shredded on the bottom...it looks like it is missing something...could not find at parts geek...anywhere else I might be able to get one??? Is it as simple as pulling 4 bolts and dropping the crossmember???
- Messages
- 10,673
- Location
- Scottsdale
Usually the diff mount noise is strong, less from turning and more from torque applied or unapplied from the engine. When torque is applied, or released, if that bushing is broken then the diff will slam against the crossmember.
4speedfunk
Well-Known Member
- Messages
- 4,250
- Location
- Tardville
Outfitter Design makes a bushing kit. Scorpworks has a crossmember exchange deal. Both can be found in the Sponsor section.
Bruces
Well-Known Member
- Messages
- 215
- Location
- Portland, TN
Outfitter design diff bushing mod is a great mod to do. Resolved my issue and will likely out last the truck.
small metal band on heat shield under passage seat rusted in half but remained in place.
that would be cheaper...its the differential bushing...should getting the parts in this week...
awalsh
Well-Known Member
- Messages
- 349
- Location
- New Jersey
Every rattling noise I've had, which has been quite a few, went away after hours of laying under the truck scratching my head looking for things could be loose. Most of the time, those heat shields are the problem and replacing the metal zip tie things does the trick!
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
- Messages
- 10,673
- Location
- Scottsdale
You know I'd like to share with you guy's about a weird rattling noise i have during a cold start. I thought at first it was my engine fan But standing next to my H3
it seems to me the noise is coming from under. BUT!!! it goes away after a few minutes of warm up. This noise is only on a cold start. Can You good folks share your input
with me please.
it seems to me the noise is coming from under. BUT!!! it goes away after a few minutes of warm up. This noise is only on a cold start. Can You good folks share your input
with me please.