04-09-2014, 02:45 PM
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#20 (permalink)
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Base Member
Join Date: Aug 2009
Location: Austin
Posts: 159
Drives: 09 Nismo
Rep Power: 16
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Quote:
Originally Posted by Eagle
I've been hearing a rattling sound too. Symptoms are very similar, rattle is almost nonexistent when first starting up and idling. Normally I notice it when I drive to and from work. Commute is about 30-35 minutes.
If I drive harder in the canyons or on the track, it gets ridiculously loud!
Thanks for finding out what it was. I had my dealer take a look and all they told me was that it was the heat shield expanding and contracting from temperature changes. Bunch of BS. I knew the sound was coming from the exhaust, just couldn't pin point where because that rattling sound carries with the piping. It sounds like it may only be the drivers side cat though
Did they just replace the cat entirely or did they remove the broken material?
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They replaced the driver side cat. Next time you have the car at the dealer, have them pull the O2 sensor. If it starts to "rain snow" a metallic dust - the converter is coming apart. At that point, they can run a scope up inside and see everything. I was lucky if you will. The scope showed a big piece of mettle laying in the way of the exhaust "flow" if you will - hence my marble sound. See my picture. Pretty cut and dry at that point.
They have to replace the entire cat since once parts/pieces start coming off it is ruined.
Good luck. 
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