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how do you know if your catalytic converter is clogged

This is a discussion on how do you know if your catalytic converter is clogged within the General Help forums, part of the LSx Technical Help Section category; Yesterday after a nice run with my car , it just shut off.I tried to turn it back on and ...

  1. #1
    now greybat66
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    pewter metalic
    2000 trans am conv

    how do you know if your catalytic converter is clogged

    Yesterday after a nice run with my car , it just shut off.I tried to turn it back on and would just shutter and turn back off.I start the car back on and would stay on running rough and then shut off.I did notice that my car was making a vibrating noise from the cats , any help would be really appreciated.

  2. #2
    Detailing + Design third_shift|studios's Avatar
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    My life is a
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    i dont' think that's the cat. I had a shitty cat and it just smelled of exhaust and threw an SES code every once in a while.

  3. #3
    Orig Regist: 9/98
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    Black
    1998 Trans Am WS6 'Vert

    If your exhaust gets quiter and your engine seems like it's losing power, especially at higher RPMs, your cat is probably clogged. This is usually preceeded by rattling noises from the cat as it's guts start falling apart.

    Johnny B - '98 "Triple Black" WS6 Convert, M6, All Options, ASC #3030 (1 of 50)
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    Pontiac Builds Excitement Silverbird01's Avatar
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    Sunset Orange Metallic
    2002 Pontiac TransAm WS6

    Does a bad converter always cause a code? My WS6 feels weak but no codes at all. I haven't noticed any odd smell from the exhaust.
    I can't figure it out.

  5. #5
    Detailing + Design third_shift|studios's Avatar
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    Quote Originally Posted by Silverbird01 View Post
    Does a bad converter always cause a code? My WS6 feels weak but no codes at all. I haven't noticed any odd smell from the exhaust.
    I can't figure it out.
    get it tuned then. it's probably just been run hard and put away wet too many times

  6. #6
    Member red99ws6's Avatar
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    red
    1999 Trans Am WS-6

    could be a cracked upper plenum. had the same problem on a 99 grand prix. see if u can smell coolant in the tailpipe. that would be a dead giveaway

  7. #7
    Member cobra12345's Avatar
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    you could measure the temp on both sides if one side is alot higher then its prob clogged mesure right before the cat

  8. #8
    PFM
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    NBM
    1998Z28

    I thought that was the purpose of the back 2 oxygen sensers to let you know then your cats are dieing?

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