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Hummer H3 with rattle sound

H3Fly

Member
Messages
15
Location
Michigan
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.
 

mjferencak

Well-Known Member
Messages
308
Location
Elbert, CO
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.
 
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