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Weird Rattling Sound??

This is a discussion on Weird Rattling Sound?? within the General Help forums, part of the LSx Technical Help Section category; my car just started doing this but when i start the car in the morning it has some weird rattling ...

  1. #1
    Member NiteRiderWs6's Avatar
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    THE WS6 THAT COULD

    Weird Rattling Sound??

    my car just started doing this but when i start the car in the morning it has some weird rattling sound comming from under the car and i cant figure out what it is. what could this be.

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    PFM
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    The insides of your cats coming loose!

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    Member NiteRiderWs6's Avatar
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    Quote Originally Posted by PFM View Post
    The insides of your cats coming loose!
    hey thanks alot man!!! i thought it was a serious problem...how can i fix this?

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    PFM
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    I had the problem for about a year until I put the LTs+catted y on mine and when we took off the old y-pipe you could shake it and hear something rattling inside the cat. The fix? I don't know unless you replace the cat. I shook mine pretty hard but what ever was loose in there was to big to fall out. Just get use to it I guess.

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    Make sure that's what it is first - try tapping on them with a rubber mallet when cold to verify. If one is coming apart GM is now covering them for 10yrs/120K. If you have a SES light get it scanned.

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    Quote Originally Posted by 2001NBMZ28 View Post
    Make sure that's what it is first - try tapping on them with a rubber mallet when cold to verify. If one is coming apart GM is now covering them for 10yrs/120K. If you have a SES light get it scanned.
    i do have a SES light somtimes so what should i do? and the rattling is comming from where the cats are.

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    Stop by somewhere that'll read codes free like Auto Zone, etc. Don't know if they can read history codes if the light is off? - but P0420 and P0430 remain in "history" for 40 ignition cycles. Visit www.gearchatter.com and look up the above codes for your year for more info.

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    Senior Member Danger731's Avatar
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    Member NiteRiderWs6's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    Make sure that's what it is first - try tapping on them with a rubber mallet when cold to verify. If one is coming apart GM is now covering them for 10yrs/120K. If you have a SES light get it scanned.
    i took a rubber mallet and hit my cat under the drivers door and it made a rattling sound

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    P0420 is for the drivers side cat if the code was thrown. I'd still get it scanned/wait for the SES to verify before contacting the dealership for free replacement. Don't want to find out it's something else and have them charge you. Here's the letter in case you need it: http://img518.imageshack.us/img518/4605/gmletterle2.jpg

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    Member NiteRiderWs6's Avatar
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    ok so i went and got the scanner tool from advanced auto and it said there werent any failures detected. the weird thing is the guy at the counter had a sweet lookin lowerd ls1 ws6 so he helped me try to figure it out but still no codes thrown everything passed.

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    If you don't have any loss of power or driveability problems I'd continue driving - if the light comes on have it read. Like I said earlier don't know if their scanners can read history codes once the light goes back off. Still could be something else. Just didn't want you to bring it to the dealer for a cat if that wasn't the problem. Buddy of mine just got the P0420 code, no aparent rattle - dealer replaced it free.

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    Quote Originally Posted by 2001NBMZ28 View Post
    If you don't have any loss of power or driveability problems I'd continue driving - if the light comes on have it read. Like I said earlier don't know if their scanners can read history codes once the light goes back off. Still could be something else. Just didn't want you to bring it to the dealer for a cat if that wasn't the problem. Buddy of mine just got the P0420 code, no aparent rattle - dealer replaced it free.

    it had the cars history of codes but there werent any failures or thrown codes

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    i still think its the cat

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    Quote Originally Posted by NiteRiderWs6 View Post
    hey thanks alot man!!! i thought it was a serious problem...how can i fix this?
    drop the cat(s) and have a broom stick 'accidentally' fall through them (gut the SOB's)...

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    Quote Originally Posted by SSwt00SS View Post
    drop the cat(s) and have a broom stick 'accidentally' fall through them (gut the SOB's)...
    lol yea the damn rattling noise comming from them are annoying as hell

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    Member Rich L's Avatar
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    Quote Originally Posted by NiteRiderWs6 View Post
    lol yea the damn rattling noise comming from them are annoying as hell
    Double check and make sure it isnt any of your o2 sensors. Sometimes they can loosen and rattle.
    2002 A4 Z28: SLP LM exhaust and HSW 100whp dry shot.

    NA: 323.4WHP@5360 RPMs, 344.2ft-lbs@4610 RPMs,
    N2O: 417.0WHP@5200 RPMs, 467.6ft-lbs@4210RPMs

    NA: 13.351@107.48mph, N2O: 12.324@117.88


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    Quote Originally Posted by Rich L View Post
    Double check and make sure it isnt any of your o2 sensors. Sometimes they can loosen and rattle.
    where are my o2's located at?

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    your sensors are on the cats

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    mine are rattling real bad. i am gonna talk to the chev dealer here and see if they will honor the new 10yr/120mile warranty.

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