2000+ Northstar Plenum Replacement steps - Page 3
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Cadillac Tech Tips - How to fix it Discussion, 2000+ Northstar Plenum Replacement steps in Item Specific Cadillac Discussion; 2004 Seville SLS Update: R&R Intake Plenum Gasket, TB gasket, and Intake Manifold Gaskets. Also, cleaned TB. Notes: No tear ...
  1. #31
    Closet Boy's Avatar
    Closet Boy is offline Cadillac Owners Fanatic
    Automobile(s): 2004 SLS
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    Jun 2005
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    Re: 2000+ Northstar Plenum Replacement steps

    2004 Seville SLS

    Update: R&R Intake Plenum Gasket, TB gasket, and Intake Manifold Gaskets. Also, cleaned TB.

    Notes: No tear in plenum gasket; however, was oddly worn. See pic below.

    2004-plenum-compare_50.jpg

  2. #32
    Chris_2011 is offline Cadillac Owners Member
    Automobile(s): 93 STS
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    Re: 2000+ Northstar Plenum Replacement steps

    Thanks very much for the tutorial! I replaced the intake plenum on my 02 SLS today. My car wasn't setting any codes but had a rough idle once the engine was warm.

    Quote Originally Posted by redfishsc View Post
    I ordered the Dorman plenum/gaskets from RockAuto, and the blue gaskets were NOT useable. They were the right "size/shape" but they would not seat firmly into the recess. Even if you managed to put them in and keep them there, they'd start falling out when you shimmied the intake back into place.

    I tried ONE of them, and since it didn't seat, I didn't touch the old gaskets. I left them in place. Cleaned them with WD40, cleaned the aluminum head where the intake bolts on with carb cleaner so that it was shiny again, and seems to be fine.
    I had the exact issue that you had with the Dorman gaskets - I also left on the original gaskets.

  3. #33
    notdel is offline Cadillac Owners Member
    Automobile(s): 04 Deville
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    Re: 2000+ Northstar Plenum Replacement steps

    Quote Originally Posted by Chris_2011 View Post
    I had the exact issue that you had with the Dorman gaskets - I also left on the original gaskets.
    +1 on this tutorial. I replaced my plenum today and also had to replace the 90* elbow on pass side of intake manifold. As for the Dorman set from RockAuto, I had only one blue gasket not seat properly so used a little silicone RTV to hold in place. All is well. Runs like a Cadillac again!!

  4. #34
    B1G-AL's Avatar
    B1G-AL is offline Cadillac Owners Member
    Automobile(s): 1972 Eldorado, 2000 Deville, 2004 CTS, 2006 SRX
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    Re: 2000+ Northstar Plenum Replacement steps

    I just did this and my Deville is running much better...however after doing the job my gas pedal is now sticky and does not smoothly press down like it did before. What could have caused this?

  5. #35
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
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    Try cleaning the TB and make sure the throttle cable isn't binding.

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