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  1. #1

    Default "Rattling" Catalytic Converter

    The left bank catalytic converter on my 2002 Chevy Subruban (5.3L flex fuel engine) has developped a rattle. The rattle resonates at only one RPM and is otherwise fairly quiet.

    Is this problem common?

    Is it the forerunner of a problem yet to come? (I just read the computer and it showed no codes pending)

    Can I just replace one converter? (the Suburban has 140K miles)

    Someone told me to tap on the catalytic converter with a rubber mallet, but I can't see how that would help.

    Any suggestions?

    Many thanks.

  2. #2

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    is it the Cat or the shield ?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #3

  4. #4


    Possibly the catalyst inside breaking apart, it could be an issue in the future if it is breaking up and continues to do this. At this point if you can live with the rattle it's a wait and see thing, eventually it'll need to be replaced but it could last years or hours no way to tell which one.

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