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LOUD engine knock

This is a discussion on LOUD engine knock within the Firebird / WS6 forums, part of the Vehicle Specific category; Just tonight I discovered a really bad knock that seems like it is coming from the driver's side of my ...

  1. #1
    Senior Member Rhinohuey's Avatar
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    LOUD engine knock

    Just tonight I discovered a really bad knock that seems like it is coming from the driver's side of my engine towards the back. Does it when car is warm or cold. You can really hear when the rpms are falling down after revving it a little bit. Sounds like it is coming from towards the top of the engine but I can't tell for sure. I'm not really sure what a bad lifter sounds like but just guessing this sounds like a worse knock. I'm about 99.9% sure its not an exhaust leak....plus its very loud and more mechanical sounding. Also Im pretty sure its not a bent pushrod just because its such a "heavy" knock. Also, oil pressure doesnt seem to fluctuate excessively or anything.

    Heres a video to hear the sound. Theres not much to see cause its dark outside but you can really hear it. (Im holding the camera basically right above the driver head right in front of the cowl.

    http://i154.photobucket.com/player.s...y/100_0189.flv

    I'm very concerned that I'm looking at a bad engine knock or maybe something like a spun bearing. Any input would be greatly appreciated.

  2. #2
    Member screaminbird's Avatar
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    might be a llifter

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    Senior Member Rhinohuey's Avatar
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    any idea how i would go about diagnosing a bad lifter?

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    Member screaminbird's Avatar
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    couldnt really tell from your vid. but is there like a tick tick tick noise? and is your ses or engine light on

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    Senior Member Rhinohuey's Avatar
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    yeah it is a tick noise but it almost seemed "heavier" if you know what I mean. No SES light.

    Another thing, I went out this morning and it seems like it has quieted almost. Its not as prominent as it was last night. I listened to it from cold to running temp and now it seems it is more of a tick than a knock.

    I attempted to long piece of alum curtain rod to see if I could pinpoint the noise like a stethoscope but the best I could do was determine the noise is coming from the back of the engine near the end of the header flange. Also, (trying to make sense of this but can't) I got the absolute most prominent tick when I would la the rod on either of the fuel rails.

  6. #6
    War Machine BIG GUNS's Avatar
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    Got you all covered in your other post: http://www.ls1.com/forums/showthread...05#post1799205

  7. #7
    Senior Member Rhinohuey's Avatar
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    thanks big guns

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