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Rattle under hood

This is a discussion on Rattle under hood within the External Engine forums, part of the LSx Technical Help Section category; I keep hearing this rattle coming from underneath my hood. I know that it is coming from a pulley, I ...

  1. #1

    Rattle under hood

    I keep hearing this rattle coming from underneath my hood. I know that it is coming from a pulley, I just can't figure out which one. I have narrowed it down to one of the lower pulleys on the passengers side. Any help?

  2. #2
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006

    94 Camaro Z28

    What type of car?
    If you think its a pulley, just get under there with a ratchet and tighten some down if you think they are loose.
    Other than that, you have to be a bit more specific.

  3. #3
    Sorry about that. It is a 2000 Formula. I don't think that any one is loose I just wonder if any need replacement and how could I tell?

  4. #4
    Senior Member
    Join Date
    Jul 2005
    Jacksonville, FL
    Usually pulleys will squeak before rattling, lower passenger side sounds like the AC tensioner/pulley. You could pull the AC belt and see if it stops to try and isolate it - gotta take off the main belt to do it though, but it's not hard.

  5. #5
    Member SR71's Avatar
    Join Date
    Nov 2005
    Irving, TX

    1998 Trans Am, 2007 TB SS

    Check your motor mounts too. I noticed some rattling coming from underneath the hood while sitting with the car in "parK" and it turned out to be the two broken motor mounts. Got two from the dealer for like $70. Good luck.

  6. #6
    Junior Member
    Join Date
    Apr 2006
    College Station

    Dark Blue
    1998 Z28 Camaro

    Most likely its your tensioner...thats usually the first to go and no big deal really.

  7. #7
    Thanks for all of the input. It turned out to be the AC tensioner. Just replaced it today for the low, low price of $69 and about an hour of my time and now there are only good sounds from under the hood.

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