2007 northstar light knocking noise
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  • 2 Post By curtc
Cadillac STS Forum - 2005 through 2012 Discussion, 2007 northstar light knocking noise in Past Cadillac Vehicle Discussion; https://www.youtube.com/watch?v=CCegpHQydP8&t=56s https://www.youtube.com/watch?v=Q6xk28mivEA doesn't sound when cold, engine oil5w30 Mobil 200 000 kms, as strange it can be, the engine doesn't ...
  1. #1
    valjan is online now Cadillac Owners Member
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    Cool 2007 northstar light knocking noise

    https://www.youtube.com/watch?v=CCegpHQydP8&t=56s
    https://www.youtube.com/watch?v=Q6xk28mivEA
    doesn't sound when cold, engine oil5w30 Mobil 200 000 kms, as strange it can be, the engine doesn't burn oil
    I've seen a few with this problem on youtube
    When i rev it around 12000 it seems to silence it. Could be the timing chain ?
    Or piston flap ?
    Feel free to reply
    These videos are before tightening

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  3. #2
    Jgrade83 is offline Cadillac Owners Member
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    Mine is doing the same damn thing.. I've taken it to the dealership 3 times with a p0171/p0174 codes, and they claim it's running fine.. I call BS.. I'm taking it to another local guy on Wednesday to Getting it figured out.

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    curtc's Avatar
    curtc is online now Cadillac Owners Master
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    Re: 2007 northstar light knocking noise

    p0171/p0174 are lean codes - If this is a N* check the intake manifold bolts (update your description so we know what we're working on), they tend to loosen up. Recommended spec is 89 inch pounds I believe, hand tight is good. Don't over tighten or you risk cracking the manifold.
    valjan and Too Fast like this.

  5. #4
    Too Fast is offline Cadillac Owners Member
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    Re: 2007 northstar light knocking noise

    Damn! RE760 Sport summer performance tires I am jealous! I just put the last set of those available, on my WS6, March of 2019, in a 275/40-17 size. Anyway, that sound you shared sounds like nothing to be concerned about. It sounds like a valvetrain noise, but not an engine knock. My Northstar sounds similar.

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    valjan is online now Cadillac Owners Member
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    Thread Starter

    Re: 2007 northstar light knocking noise

    https://www.youtube.com/watch?v=jW4X1xMQew0
    After tightening intake manifold the bolts were so loose i could tighten them by hand.
    It silenced it be 80% thank you. We learn everyday.
    This video is after tightening intake

  7. #6
    valjan is online now Cadillac Owners Member
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    Thread Starter

    Re: 2007 northstar light knocking noise

    Yes i like those RE760 but on wet not so much. I just tighten the intake manifold following an advice from curtcand it silenced it by 80%
    You should listen to both videos, before and after

  8. #7
    LsGsSTS's Avatar
    LsGsSTS is online now Cadillac Owners Connoisseur
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    Re: 2007 northstar light knocking noise

    I've got RE11's on my convertible. The variable valve timing on this gen N* can be a little noisy. Nothing to worry about. Manifold tightening sequence:
    NorthstarIntakeBoltSeqeunce.jpg

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