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Cats going out?

This is a discussion on Cats going out? within the External Engine forums, part of the LSx Technical Help Section category; Im getting a ratteling noise from my exhaust. Near the front, if you push it doesnt go away. My brothers ...

  1. #1
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    Cats going out?

    Im getting a ratteling noise from my exhaust. Near the front, if you push it doesnt go away. My brothers are saying its the cats, but i just had them replaced, because of the recall. Is there anyway to know for sure if its the cats....hurting for money, i guess im just going to save up for the headers

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    War Machine BIG GUNS's Avatar
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    Yeah, mine were rattling and I had them replaced under warranty too. I would take them back if you are hurting for money and see what they say.

    I have two brand new CATS now and then I put headers on.

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    cutting and welding mark21742's Avatar
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    check to be sure you don't have a loose heat sheild. they have small weak spotwelds and when one breaks loose they can make a hell of a rattle

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    Something Diabolical... chuckie669's Avatar
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    I took mine in for a few years and they told me the rattle was the 02 sensor. Said that it worked fine but was rattling. They also changed the cats no charge at that time to be safe. had it rattle for another 2 years before putting headers on and chunking that rattling 02 in the garbage.

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    Member nillam1's Avatar
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    Quote Originally Posted by mark21742 View Post
    check to be sure you don't have a loose heat sheild. they have small weak spotwelds and when one breaks loose they can make a hell of a rattle
    I agree it could be a heat shield but the 2 sound different, if it sounds muffled it's the cats. Wait a day or 2, there is a good video on youtube that nails the sound of the cats perfectly! If somone could post the link, I would like to hear it again also.
    2002 Camaro Z28 Bolt ons, Flowmaster catback w/3" QTP electric cutout, Superchips tuned, Granatelli MAF, SLP cold air induction Lid & filter, ZEX powertune plugs, Taylor 10.4mm wires, 160 T-stat w/fan control, Eibach sportlines & BFG-KDW's on 17" SLP SS rims.

  6. #6
    Senior Member TransAm11973's Avatar
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    mine were all broken up inside so i took them out

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