H3 Noise when engaged in D or R

[altide8]

So my 2008 h3 started making a weird rattling noise when it is put in drive or reverse. It sounds like metal rattling. It also does it at the beginning of acceleration. I'm not sure what it is.

[video=youtube;yNi-QJjb1hM]https://www.youtube.com/watch?v=yNi-QJjb1hM[/video]


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[Chimpy]

So, it only does it under initial acceleration, not coasting? Does rattling sound change along with increase in RPMs? Check exhaust hangers. Take a listen to exhaust manifold shield. Also listen to catalytic converter. You will obviously need an assistant to put the vehicle in D and R while you check these items.
I had a 99 ZR2 Blazer i bought used that would make a weird rattling sound at idle, whether in P, R, N or D. It would also make the sound under initial acceleration but went away as RPMS increased. Ended up being the "honeycomb" in the catalytic converter was coming apart. I replaced the rattling converter with a high-flow model and not only did the noise go away, the Blazer ran better than it ever had while I owned it. Hope this helps. Rule out the easy stuff first.

 

[Happy Hummer]

Agreed. Multiple heat shields to be found on h3 exhaust. Check all of them.

 

[altide8]

I removed the heat shield over the manifold completely. That didn't fix it.. All of the other heat shields are good as well
It does not do it under normal coasting. Only on the initial acceleration


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[H32NV]

Had a similar issue. Look at your front crossmember to be sure it's tight, and look at the output of the transfer case, near the transmission mount. Sounds like you have a loose crossmember or worn trans mount. Mine was a worn trans mount.

 

[Clark]

Take a look at the small protective plate or shield bolted onto the passenger side of the transmission right next to the pan. This happened to me a matter of fact
last week. I came to a stop and suddenly I got a bad rattle noise. I thought the worst "oh god is my tranny going on me? just what I need". That plate about
12" long and covers the sensor broke in half because of rust. it's bolted on with 2 small 1/2 inch bolts. See if you have it too.

 

[altide8]

Take a look at the small protective plate or shield bolted onto the passenger side of the transmission right next to the pan. This happened to me a matter of fact
last week. I came to a stop and suddenly I got a bad rattle noise. I thought the worst "oh god is my tranny going on me? just what I need". That plate about
12" long and covers the sensor broke in half because of rust. it's bolted on with 2 small 1/2 inch bolts. See if you have it too.

I'll take a look at it in the morning. Thanks a ton!


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[Stugots]

I have a rattle when I'm at around 900 RPM's. It appears to be coming from the shifter area inside the vehicle. I check all the usual areas but nothing is loose, its driving me nuts.

 

[Stugots]

Follow up on my vibration issue at 900 rpm's.....I cable-tied these 2 hoses together and haven't had the vibration since, hopefully this is the solution to my issue.