How to: change your spark plugs
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2008-2013 Cadillac CTS General Discussion Discussion, How to: change your spark plugs in Cadillac CTS Second Generation Forum - 2008-2013; So I decided to go with the E3's as I found them for $20 on a clearance so I had ...
  1. #1
    bojangle is offline Cadillac Owners Fanatic
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    How to: change your spark plugs

    So I decided to go with the E3's as I found them for $20 on a clearance so I had to get them. I'm glad I did as I can honestly feel a difference.
    *first remove the oil cap





    *you can just pop the top off and pull up and forward



    *there's a little fiberglass piece that you need to pull 2 plastic pins out



    *you can then twist and pull out side ways



    *then I started unhooking vacuum lines around the plenum







    Merge and xphilliex like this.

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  3. #2
    bojangle is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    *then i started unhooking the brackets for the harness, here is one there's a few



    this one you have to unbolt a 15 m bolt at the bottom of the bracket



    and unbolt it from up top



    now I unbolted the intake off the throttle body



    after that I loosened the bolts on the plenum





    now you can lift the plenum up and remove the coil pack bolt (10 mil)



    now remove the spark plug



    after you do all of them just reverse order and put everything back together and start it up, runs way better. didnt notice how rough the idol was until i did this
    and questions feel free to ask and I'll do my best to help
    Nick
    xphilliex likes this.

  4. #3
    tonyfort's Avatar
    tonyfort is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    Nice write up! IIRC those owners with the 3.6DI engine don't need to remove or loosen the plenum as it's narrower and you can get to the plugs without moving it. Someone correct me if I'm wrong though...

  5. #4
    bojangle is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    Quote Originally Posted by tonyfort View Post
    Nice write up! IIRC those owners with the 3.6DI engine don't need to remove or loosen the plenum as it's narrower and you can get to the plugs without moving it. Someone correct me if I'm wrong though...
    Thank you for pointing that out, this is a non DI

  6. #5
    MoFex's Avatar
    MoFex is offline Cadillac Owners Connoisseur
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    Re: How to: change your spark plugs

    Quote Originally Posted by tonyfort View Post
    Nice write up! IIRC those owners with the 3.6DI engine don't need to remove or loosen the plenum as it's narrower and you can get to the plugs without moving it. Someone correct me if I'm wrong though...
    Yes, you are right. For DI engine you do not need to touch the plenum.....

  7. #6
    Surfstix is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    Could have rebuilt a 350 C.I. in the time it takes to change plugs lol, nice tutorial though Thanks

  8. #7
    ctsfan2009 is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    Just curious, how many miles did yours have on it when you replaced the plugs?
    sberl and sberl like this.

  9. #8
    DaPurpleRT is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    So, maybe I should just swap the plugs myself on my 09 DI since I don't have to remove the intake or the like?

    ----------

    Also, on the DI is it one plug per coil (6 total) or 2 (12 total)?

  10. #9
    tinman's Avatar
    tinman is offline Cadillac Owners Master
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    Re: How to: change your spark plugs

    I haven't tackled this yet on my 3.6DI.

    From looking at the pictures it appears that the plugs are recessed in a cavity, correct (last picture, post #2) ? If so, then I would recommend shooting some compressed air in there before removing the plugs just in case there are any foreign particles/sand/debris in there that could fall into the cylinder.

    Also, be sure to properly torque the plugs and the bolts to spec. In addition, I recommend some anti-seize on the plugs before replacing.
    MoFex, MoFex, DMill and 3 others like this.

  11. #10
    cadillaccts08 is offline Cadillac Owners Member
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    Re: How to: change your spark plugs

    Need help. 2008 cts 3.6.... What is the proper torque for plenum and also for spark plugs can't find information... diy project..Thanks.

  12. #11
    like2drive's Avatar
    like2drive is offline Cadillac Owners Fanatic
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    Re: How to: change your spark plugs

    Quote Originally Posted by ctsfan2009 View Post
    Just curious, how many miles did yours have on it when you replaced the plugs?


    Bojangle, I would also like to know how many miles on your CTS?
    Mine has ~63k miles, 3.6L non-DI like yours. Ilde nice and smooth though. Wondered when I should think of changing the plugs? Heard they are good for 100k miles...?

  13. #12
    tinman's Avatar
    tinman is offline Cadillac Owners Master
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    Re: How to: change your spark plugs

    Quote Originally Posted by cadillaccts08 View Post
    Need help. 2008 cts 3.6.... What is the proper torque for plenum and also for spark plugs can't find information... diy project..Thanks.
    I have run a search on this site and have not found the answer.

  14. #13
    CadaMike is offline Cadillac Owners Member
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    Re: How to: change your spark plugs

    I'm interested in changing plugs on my 2010 3.6 DI

    When you said e3 are they these? http://shop.advanceautoparts.com/p/e...lug#fragment-2

    Also, anything else we should know about changing the plugs?

  15. #14
    CadaMike is offline Cadillac Owners Member
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    Re: How to: change your spark plugs

    Bump for talk about DI engines

    And still confused about the E3 plugs..
    There's mixed reviews everywhere

  16. #15
    morrisdl is offline Cadillac Owners Member
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    Re: How to: change your spark plugs

    Well, I have a 2009 3.6 DI. In the past I had some engine hesitation at 70,000 miles I took the car to the dealer with a P03001 error. They claimed that the number one cylinder was misfiring and required a new ignition coil for that cylinder. I complained that they should have replaced all coils but they stated that the other coils may never fail. Well, when I had some engine hesitation again at 90,000 miles, I decided to change all the coils. With a little research I found that the AC Delco D501C ignition coil is the OEM unit. I found a set of six on Amazon for a very good price. My son and I swapped them and the car ran fine…. Well at 100,000 miles the hesitation returned and I have a P03003 error code and I castigated myself for not replacing the plugs (AC Delco 41-990) when I swapped the coils. Now the lessons learned.

    Number one, coil and plug replacement on a 3.6L Direct Injection engine is easy. You have some minor hose lines to move, a 10MM wrench, a 10 MM socket with some extensions and a ratchet wrench, a 5/8 inch spark plug socket, and a torque wrench if you want to be real accurate on plug installation.

    Number two, use dielectric grease to coat the inside of the coil spark plug boot…. This is a must… and I learned this the hard way. I did not use dielectric grease on the coils installed at 90,000 miles and when I decided to replace the plugs at 100,000 I found that the spark plug boot had welded to the insulator on the spark plug. THIS IS A REAL PROBLEM… because the boots rip and are down inside the head. Sooo… I had to pull out the coils, the spark plug boots ripped and I had to buy some long needle nose pliers to pick and pick and pick until all the rubber was out.

    Number three, the coils are secured by a 10MM bolt that goes into a brass plug by each cylinder. Do not over tighten. Do not!! The brass plug can break loose and spin inside the head. This is something I am still trying to work out. I have not figured out how to get the last two of my coils… so this is one of those lessons I have learned well…

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