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knocking/rattling after intake manifold install

This is a discussion on knocking/rattling after intake manifold install within the General Help forums, part of the LSx Technical Help Section category; I removed my intake manifold, swapped out a knock sensor and re-installed the intake. Now I have a loud rattling/knocking ...

  1. #1
    Member ZForce1's Avatar
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    1999 camaro Z28

    knocking/rattling after intake manifold install

    I removed my intake manifold, swapped out a knock sensor and re-installed the intake. Now I have a loud rattling/knocking sound coming from both cylinder banks. Like really loud valve clatter or worse. How could I screw up installing an intake manifold to cause something like this?

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    Waiting on the Tree transamtom's Avatar
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    1999 TA A4

    How much dirt and crud was under the manifold?

    Did you put socks down the ports when you cleaned it?

    Are you missing any tools or the clips off the KS harness?

    Was the old sensors plastic all hard and cracked? where did the pieces go if it was?

  3. #3
    I don't sell out! blackSS01's Avatar
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    Sounds like something could have fallen down into the motor. I wouldn't run it and pull the manifold again. Don't want to damage anything major

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    expensive tires az gt eater's Avatar
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    Open it back up, get a shop vac down in the cylinder air ports. Start with a clean shop vac, and see if anything comes back out.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by transamtom View Post
    How much dirt and crud was under the manifold?

    Did you put socks down the ports when you cleaned it?

    Are you missing any tools or the clips off the KS harness?

    Was the old sensors plastic all hard and cracked? where did the pieces go if it was?
    Quote Originally Posted by blackSS01 View Post
    Sounds like something could have fallen down into the motor. I wouldn't run it and pull the manifold again. Don't want to damage anything major
    Quote Originally Posted by az gt eater View Post
    Open it back up, get a shop vac down in the cylinder air ports. Start with a clean shop vac, and see if anything comes back out.
    All of this.


    Whenever the intake is off I will always use masking tape to keep everything out.

  6. #6
    Member ZForce1's Avatar
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    I'm afraid you may be right. I pulled the intake back off because I missed a small vacuum line on the back of the intake manifold. Looked everything over, put it all back together and it still does it. Runs REAL BAD. I guess there is nothing else it could be, huh? I did not drop any tools or hardware during the job. However, I did break the oil pressure sending unit, because I did not know the brake bleed line ran around it. I thought I got it all, but a piece must have fallen in that I never saw.

  7. #7
    Your friendly policeman FinZ28's Avatar
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    My guess after reading a couple of posts was something happened with the OPSU.

    Do you have any part of it left to maybe figure out what's missing?
    Last edited by FinZ28; 04-10-2012 at 05:44 PM.
    2001 Chevy Camaro Z28 A4
    SLP cold air intake/lid, SLP smooth bellow, Pacesetter LT's, ORY, Magnaflow exhaust, BMR STB, adjustable Panhard rod, SFC's, LCA's, 1LE sway bars, cross-drilled rotors

  8. #8
    Member ZForce1's Avatar
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    I'm not sure about all the internal parts of the opsu, but it did break in half and there was a yellow plastic thing about 1/2" diameter with a metal tab on it and two prongs about an inch or so long that think fell out from the inside of it when it broke. the top that broke off was all in one piece and it made it's way out of the engine in one piece. The bottom piece I removed with a special socket. It looked like I had it all, but I would have to buy another one for $50 and take it apart and compare it to the old one to be sure.

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