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2008-2013 Cadillac CTS General Discussion Discussion, Spark plugs in Cadillac CTS Second Generation Forum - 2008-2013; Recheck posts 4,5,6. I thought those posts along with MoFex's post just before this post had some positive answers....
  1. #16
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: Spark plugs

    Recheck posts 4,5,6. I thought those posts along with MoFex's post just before this post had some positive answers.

  2. #17
    99flhr is offline Cadillac Owners Enthusiast
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    Re: Spark plugs

    Quote Originally Posted by anpirz View Post
    Not much help guys.[COLOR="Silver"]
    ----------
    I apologize that you did not receive validation of your concept, however, that doesn`t mean the "guys" aren`t trying to help.
    Sorry.

  3. #18
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    anpirz is offline Cadillac Owners Member
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    Thank you, you have been very helpful. I will just stick to the iridiums.

    ----------

    And sorry if I didn't feel that being told to put a sticker on my car for 5 more hp was helpful.

  4. #19
    00 ss is offline Cadillac Owners Fanatic
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    Re: Spark plugs

    I would have to agree that you aren't going to get any performance gain from one plug over another. Changing out worn out plugs with new ones will usually improve performance. Mae sure you get the right plug model though, because putting the wrong plugs in can hurt performance.

    The only way I've seen real gains from plugs is when they were indexed and rotated to maximize the spark exposure to the incoming fuel and air charge. Although, this may not work at all in a DI engine.

  5. #20
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    Re: Spark plugs

    Also very important is to get the right temperature range plugs for your driving conditions. I've seen drivability concerns when using the incorrect range. If the factory plugs come out looking good, I would just stay with that plug.

  6. #21
    tinman's Avatar
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    Re: Spark plugs

    Quote Originally Posted by anpirz View Post
    And sorry if I didn't feel that being told to put a sticker on my car for 5 more hp was helpful.
    Man, this is the internet. You have to grow that thick skin.
    Tbbt likes this.

  7. #22
    HurstGN is offline Cadillac Owners Enthusiast
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    Re: Spark plugs

    I will add that I have an Autolite AR5383 Racing plug on my desk. It came out of Cory Mac's top fuel dragster some years ago. This plug supported 8K+ horsepower, and it is side gapped. So the side gapping may be beneficial to some degree.

    Disclaimer, this plug only made 1 run. Top fuel teams use a plug for 1 run then toss it. So I don't know how the side gapping would work over a longer mileage period.

  8. #23
    eborunda's Avatar
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    I use Denso in mine

  9. #24
    tinman's Avatar
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    Re: Spark plugs

    Denso makes some good stuff. I haven't had problems with them in the past.

  10. #25
    99flhr is offline Cadillac Owners Enthusiast
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    Re: Spark plugs

    Quote Originally Posted by HurstGN View Post
    I will add that I have an Autolite AR5383 Racing plug on my desk. It came out of Cory Mac's top fuel dragster some years ago. This plug supported 8K+ horsepower, and it is side gapped. So the side gapping may be beneficial to some degree.
    Can`t disagree when you are looking for E.T. gains 3 places to the right of the decimal point. ...May or may not apply to those of us just commuting to work. ...
    HurstGN likes this.

  11. #26
    Wojciech is offline Cadillac Owners Member
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    Re: Spark plugs

    Can anyone tell me what is replacement plugs for 41-990 (3.6 DI). Bosh or NGK
    I'm live in europe so I have to change it quick - missfire.

    Thanks

  12. #27
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    Re: Spark plugs

    Wojtek,

    NGK (6509) LTR6IX-11 Iridium IX will work. If you have missfire you may also need to change coils. That what happened to me.
    Wojciech likes this.

  13. #28
    Wojciech is offline Cadillac Owners Member
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    Re: Spark plugs

    How long can I drive lika that? On 5 cilinders.
    Unfortunatelly shippment will takes about 7 days and I need to drive to work.
    Is computer disbale injection on "missing" cilinder?

  14. #29
    MoFex's Avatar
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    Re: Spark plugs

    I am not sure. I think the fuel is still injected to the cylinder. It might adversely affect catalytic converter, not sure though.

    maybe others can pitch in?

  15. #30
    99flhr is offline Cadillac Owners Enthusiast
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    Re: Spark plugs

    Quote Originally Posted by Wojciech View Post
    Unfortunatelly shippment will takes about 7 days and I need to drive to work.
    Shipment of the plug recommended by Mofex or a replacement coil?
    If it`s the plug, I would screw in any readily available equivalent plug, as I assume that fuel is still being delivered to the dead cylinder.
    I would order a coil now as that seems likely, even if it`s not the problem, if you have long lead times on parts it would be a good idea to have one on hand

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