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STLCarRepair

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  1. #1
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    Brian Rota
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    Default Motor noise/clunk LT1

    Hello
    I have a 1996 LT1 firebird.
    I have a noise which I think is on the passenger side.
    The car has a new water pump
    I took the belt off and can still hear the noise.

    It sounded like it was coming from rockarms but they seem to be running. I do not know the history of the motor. I was surprised to see roller rockers.

    The car seems to have oil pressure I do have CEL for Crank position sensor

    If you watch the video below you can hear it. I think it sounds like it washing machine with shoes in it.

    Last edited by brota; 08-29-2019 at 11:26 PM.

  2. #2
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    Default

    Sounds like a rod knock to me.
    Adam Legatt 95 trans am, 355 LE ported 21* TFS heads SS4000, 9'' 11.18@ 121.5 mph

  3. #3
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    Default

    Quote Originally Posted by adam85 View Post
    Sounds like a rod knock to me.

    Is there an easy way to test/determine?

    Thank you

  4. #4
    Long Live the Opti


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    Default

    I'm sorry to say that's rod knock all the way man. How's oil pressure? Probably lower than normal? Maybe really low?
    Quote Originally Posted by Ryan Stout View Post
    I would try to work my neck muscles but I'm not invited to the LS guy parties.

  5. #5
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    Default

    Quote Originally Posted by Fastbird View Post
    I'm sorry to say that's rod knock all the way man. How's oil pressure? Probably lower than normal? Maybe really low?
    What I was expecting but was hoping an exhaust leak or something. Will check oil pressure later.

  6. #6
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    Mike Storm "Stormy"
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    Default

    I was going to say exhaust leak as well. but rod knock maybe just rev it a bit it should make a more rivmic sound on declaration but that can be the big end
    Last edited by Stormyweather; 08-31-2019 at 02:03 PM.



    1995 Trans Am - CAI - TB coolant bypass - Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily. .

  7. #7
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    Default

    It seems to be on the top under intake sounded like running through valve cover.
    Where could the exhaust leak be?

    I will try to run it and check the oil pressure.

  8. #8
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    OK i tightened a couple exhaust manifold bolts because I was going to change them.
    Put the valve covers back on.
    Put heat loose heat shield back in place.

    Oil pressure was 60 on start up and I did not see it go below 20 when idle and hot.
    I dont hear it or hear as much




  9. #9
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    Hard to tell over the internet but I can still hear a knock in the videos. I would drain the oil and cut the filter open at this point.
    Adam Legatt 95 trans am, 355 LE ported 21* TFS heads SS4000, 9'' 11.18@ 121.5 mph

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