737 Jock

We had a tinny rattle from underneath during cornering and reversing uphill.

The secondary catalytic converter has a thin aluminum heat-shield which bends easily. The corner of it was chafing on the heat-shield for the A/C drain:



Here is a close-up of the contact. The dent in the drain's heat shield is visible. To fix, simply bend the tab on the corner of the cat heat shield away from the A/C drain. Your hands or any kind of pliers should work:



Make about 8mm clearance and the noise should stop:

MMike1981

dude, ur posts are the best.

wspy

^ Oh for real!

Further, I had my secondary cat R&R with a straight through pipe.

InfamousJamous

So that's where the rattle was coming from! It would rattle at idle and annoyed me so much!! I was afraid it was knock, ping, or something wrong with the turbo since it sounded like it came from that area.

I laid down some cardboard, crawled under, and fixed it in minutes. Thanks!

superblast

Wow, I just started noticing that noise last week and was wondering how I was going to describe it. You nailed it with your description though. Thanks so much for the detailed fix!

brizey

I had the noise and fixed it years ago...I am just not as nice of a guy as 737 and kept it to myself, lol.

Kristoefur

I think I've got this same dreaded rattle, but have yet attempted to fix it. Did anyone notice that the rattle is more audible after the car has been sitting for a long period of time? I hear it the most in the morning.

jchungum

Thanks for your help 737 Jock. This rattle started a week ago, and I knew it was not brake or engine related. I got under my 2007 RDX tonight, bent back the heat shield and all is good now!

rossmo

Anyone have the pics for this process? I don't see them above anymore. thanks!

mass978

Bump, anyone got any photos of this mod? I just bought a 12' and believe I'm hearing this too!

CSmoney28

Sleepyosu

My heat shield was starting to rust off by the bolts.
I drilled 4 holes through the 4 layers.
I used scrap 12 gauge bare copper solid core home electrical wire.
Twisted each tight its 100% better.

CSmoney28

Any pictures 😃?