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  1. #1
    Bald Tire
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    Oct 2017
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    Michigan
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    Hummer H3 with rattle sound

    Hello,

    On my 2007 Hummer H3 I have a strange rumble/rattle sound. It happened when the engine is cold and I put my foot on the brake and shift into reverse. As I reverse, it makes the sound for about 10-20 seconds and then its gone. I usually do not hear it once the engine is warm. Any ideas of what it is? I do not think that it is the heat shield. Have had heat shield issue on our other hummer and it only was only an issue during acceleration and rough idles.

  2. #2
    Mud Terrain
    Join Date
    Feb 2012
    Location
    Wisconsin
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    I would still check all the heat shields just to be sure.

  3. #3
    Low Profile
    Join Date
    Nov 2015
    Location
    Suffolk County, New York
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    Just in case, check the small heat shield located on the bend of the tail pipe.
    Support Autism
    2002 Black HMCS
    2006 Blue H3

  4. #4
    Baja
    Join Date
    Oct 2012
    Location
    Bellflower, CA
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    Cold and low RPM idle means rough idling engine for a few minutes.
    2006 H3 Adventure & modified Rancho with SOA

  5. #5
    Low Profile
    Join Date
    Oct 2013
    Location
    Vancleave, MS
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    Make sure all the bolts for your mounting points are tight. (engine mounts, crossmember bolts, front diff bolts) There may be a small chance that there is a slight gap somewhere and then when the engine bay rises in temp the metal expands and corrects the gap.
    I use mine.


 

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