Time for new spark plugs
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Cadillac STS Forum - 2005 through 2012 Discussion, Time for new spark plugs in Past Cadillac Vehicle Discussion; It's time for me to change my plugs. My car is a 2005 with the N*. How do I find ...
  1. #1
    BlackedouT STS is offline Cadillac Owners Member
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    Time for new spark plugs

    It's time for me to change my plugs. My car is a 2005 with the N*. How do I find out if my car has AC Delco plugs or Denso plugs without pulling one out? One dealer told me they are AC Delco and another told me they are Denso.

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  3. #2
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Time for new spark plugs

    Some AC plugs are being made by Denso.

    FWIW, Albert Champion was a French bicycle racer in the early 1900s that made spark plugs for a sideline. His investors dropped him and kept his name, Champion for the company. Albert joined forces with GM and became AC sparkplug.
    Don't mess with Binky Bear!


  4. #3
    malatu's Avatar
    malatu is offline Cadillac Owners Enthusiast
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    Re: Time for new spark plugs

    Koz knows that cause he played poker with Al's older brother!

  5. #4
    scott9001 is offline Cadillac Owners Fanatic
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    Re: Time for new spark plugs

    i wouldent put anything but AC delco in mine and i would hope you would think the same!

  6. #5
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Time for new spark plugs

    North*s are notorious for choking on sparkplugs other than OEM.
    Don't mess with Binky Bear!


  7. #6
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
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    Re: Time for new spark plugs

    No doubt...especially the FWD versions.

  8. #7
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: Time for new spark plugs

    Our old '95 3.5L Dodge Intrepid was very picky about plugs, too, so beware....

    "But it's platinum-tipped, it's better!"

    Maybe...but that doesn't mean the engine runs properly, afterward.

  9. #8
    bbshriver's Avatar
    bbshriver is offline Cadillac Owners Enthusiast
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    Re: Time for new spark plugs

    I used Bosch Iridium in my 2005 N*... runs great.

  10. #9
    BlackedouT STS is offline Cadillac Owners Member
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    Re: Time for new spark plugs

    Thanks for the input. I'm going to install the new AC Delco plugs this weekend.

  11. #10
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Time for new spark plugs

    Quote Originally Posted by bbshriver View Post
    I used Bosch Iridium in my 2005 N*... runs great.
    History has shown that Bosch fine wire plugs in particular, don't last long in a North*. Good luck.
    Don't mess with Binky Bear!


  12. #11
    shortfur7 is offline Cadillac Owners Member
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    Re: Time for new spark plugs

    What come standard in the 2005 N*? Is it the AC copper, platinum, or iridium? Because the dealer is giving my an option of all 3.
    I need to do mine to because there is 120K miles on it and i dont think they have ever been changed.

  13. #12
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Time for new spark plugs

    I think they are platinum. Acording to my 2006 manual:

    V6 (not DI) - GM 12597464 or AC 41-990
    V8 (4.4 SC) - GM 12592619 or AC 41-991
    V8 (4.6 NA) - GM 12571533 or AC 41-986

  14. #13
    shortfur7 is offline Cadillac Owners Member
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    Re: Time for new spark plugs

    Quote Originally Posted by EChas3 View Post
    I think they are platinum. Acording to my 2006 manual:

    V6 (not DI) - GM 12597464 or AC 41-990
    V8 (4.4 SC) - GM 12592619 or AC 41-991
    V8 (4.6 NA) - GM 12571533 or AC 41-986
    Thanks for the help.

  15. #14
    jmildoc's Avatar
    jmildoc is offline Cadillac Owners Fanatic
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    Any harm in changing just 4 plugs??

  16. #15
    malatu's Avatar
    malatu is offline Cadillac Owners Enthusiast
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    Re: Time for new spark plugs

    That would be comparative to buying only three new tires and leaving one old one on the car. Sure you could do it but will when will you replace the remaining plugs at a later date? For practicality purposes, it makes a great deal of sense to change all of them at once. Personally, I wouldn't consider replacing only four plugs.

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