How To: 2.8L Spark Plug Change (same for 3.6L)
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, How To: 2.8L Spark Plug Change (same for 3.6L) in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Alright here is a little how to on changing spark plugs in a 2007 CTS 2.8L. I believe its the ...
  1. #1
    ride_002000's Avatar
    ride_002000 is offline Cadillac Owners Fanatic
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    How To: 2.8L Spark Plug Change (same for 3.6L)

    Alright here is a little how to on changing spark plugs in a 2007 CTS 2.8L. I believe its the same with a 3.6L but not sure. The way I did it was not to completely remove the intake manifold, I did not remove every clip and hose that is required to completely remove it, rather I removed what was necessary in order to get access to the plugs and COP's.

    Disclaimer: I am not responsible for your actions or the well being of your vehicle. This is to document my experience with my own vehicle. Try this at your own risk. Now that thats out of the way on to the how to.

    Total time: 1.25-1.5hrs
    Tools Involved:
    - Regular screw driver
    - Various sockets, extensions & a ratchet
    - Spark plug socket


    1. Remove the engine cover, just give it a good pull and it will pop off.

    2. Remove intake coupling that connects to throttle body

    3. I forgot to take a pic of this but there is a stud near the throttle body that holds down the front of the engine cover that needs to be removed which holds a bracket, there also is a 13mm bolt that needs to be removed also, you will see it.

    4. On the drivers side of engine bay there is a hose that needs to be removed. Located in this pic.



    5. Remove this clip, hose & bolt shown in pic on drivers side.




    6. Remove this hose



    7. Now on to the passenger side, remove this bolt.



    8. Remove the hose and bolt shown below.



    9. Remove this bolt.



    10. Now unbolt the 6 bolts holding down the manifold but dont remove them.



    11. Ok once the manifold bolts are all unbolted you can move onto the plugs.
    I started on the drivers side in the far back. You have to unbolt the bolt holding down the COP and then undo the harness connecting to the coil, then it can be pulled out and the plug removed and the new one installed.



    12. I did the drivers side back 2 with no interference from the manifold, the one closest to the front is obstructed by the manifold but since you removed everything in steps 1-10 you can now lift up on the manifold that will get you enough room to get the coil and plug out.

    13. Now that the drivers side is done, move on to passenger side rear plug, this one is also not obstructed by the manifold and can be removed easily. The front 2 on the passenger side need to have the manifold lifted up in order to gain access to the COP's. Below is a pic of me lifting up slightly on the manifold, I only had one hand so it isnt lifted up all that it can go.




    14. Once all the plugs are in and COP's are bolted back down you can start putting everything back together and bolts tightened back down.

    Hope this helps anyone that is not sure if they have the skills to tackle it, but it really isnt bad...all you have to do is unbolt stuff and move it out of the way.
    Attached Images

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  3. #2
    SWells is offline Cadillac Owners Member
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    re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Excellent write up! I did mine a month ago exactly the same way and have had no gasket leak issues. Only other thing I did was to treat all the electrical connectors with a blob of dielectric grease.....little bit of extra insurance.

  4. #3
    JimmyH is offline Cadillac Owners 10000+ Posts
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    re: How To: 2.8L Spark Plug Change (same for 3.6L)

    excellent

    added to the faq thread

  5. #4
    JimmyH is offline Cadillac Owners 10000+ Posts
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    re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Hope you don't mind, since this is a DIY, I copied the images to our server so they don't get lost down the road.

  6. #5
    ride_002000's Avatar
    ride_002000 is offline Cadillac Owners Fanatic
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    Thread Starter

    re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Great sounds good. And hope this helps ppl in the future.

  7. #6
    cba123 is offline Cadillac Owners Member
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    re: How To: 2.8L Spark Plug Change (same for 3.6L)

    excellent step by step instructions!! worked great and saved me $400! and car runs great as well!

  8. #7
    SHORTSTACK's Avatar
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    How did you get the rear manifold bolt loose? I have very little clearance in mine. I can fit a socket over it but not a ratchet or a wrench..

  9. #8
    Kingoftypos is offline Cadillac Owners Master
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    Someone was able to remove the shroud that surrounds the cabin air filter and whatever else is in there. I assume the battery was removed too. I remember seeing a picture of it here. But I do not remember what thread. Nor how many bolts were removed of where they were for the plastic piece.

    KOT

  10. #9
    SHORTSTACK's Avatar
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Alright, i just replaced my cabin air filter so i know exactly what to do. Thanks for the suggestion bud.

  11. #10
    SHORTSTACK's Avatar
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    An observation, While you are moving the intake manifold around to get to the coil packs. You could possibly be damaging the plenum gasket. I suggest the complete removal of the Intake manifold for this process.

  12. #11
    74chvy glasshouse is offline Cadillac Owners Fanatic
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    U do yours shortstack? How u remove whole manifold? was your gasket the paper one? Wat plugs use

  13. #12
    SHORTSTACK's Avatar
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Quote Originally Posted by 74chvy glasshouse View Post
    U do yours shortstack? How u remove whole manifold? was your gasket the paper one? Wat plugs use
    http://www.cadillacforums.com/forums...iceolater.html

    No i had aluminum gaskets.

  14. #13
    josney's Avatar
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    ride_002000, nice write-up. SHORTSTUFF's was much better though, he had BEER and A PISTOL
    SHORTSTACK and SHORTSTACK like this.

  15. #14
    Jhayzhone's Avatar
    Jhayzhone is offline Cadillac Owners Member
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    Well done.. Im going tondo this before winter comes, thanks for the info and pictures.

  16. #15
    454Casull is offline Cadillac Owners Fanatic
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    Re: How To: 2.8L Spark Plug Change (same for 3.6L)

    Anyone know who the OEM is for the AC Delco factory plugs? I have a set and I'm hoping it's not Bosch.

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