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Cadillac STS-V Series Forum Discussion, spark plugs in Cadillac V-Series Forums; I was told that the ngk tr7 is to cold of a plug for the sts v.. any truth to ...
  1. #1
    pjeter is offline Cadillac Owners Member
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    spark plugs

    I was told that the ngk tr7 is to cold of a plug for the sts v.. any truth to that?


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  3. #2
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
    Automobile(s): 2013 OBM CTS-V Coupe
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    Re: spark plugs

    Nope. Check the NGK site. They show the 7 as our stock plug. I have a set of them in my car as we speak. They work just fine.

    Home » Part Finder » Car Truck Suv

    Cars, Trucks & SUVs

    2006 CADILLAC STS V 4.4 V8 D FI Supercharged

    Spark Plug Part No. Stock No. Plug Gap Photo
    Iridium IX TR7IX 3690 .040


    Oxygen Sensor Part No. Location Note Photo
    Oxygen Sensor 21561 Pre-Cat Left n/a
    Oxygen Sensor 21561 Pre-Cat Right n/a
    Oxygen Sensor 21566 Post-Cat Left n/a
    Oxygen Sensor 21566 Post-Cat Right n/a

  4. #3
    pjeter is offline Cadillac Owners Member
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    Thread Starter
    when I was taking the car to get tuned jessi had asked my what kind of plugs. When i tokd him tr7s he didnt want to do the tune unless i put tr6 i told him i would but never did.

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  6. #4
    TimmyC is offline Cadillac Owners Connoisseur
    Automobile(s): 2006 STS-V and 2007 STS-V The Murdalac
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    Re: spark plugs

    The stock plugs in my car were not 7s. They were 6s. I put the trix7 in there with no problems.

    Oops, didn't mean to sound jerky like that.

  7. #5
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: spark plugs

    That is what I thought so I called NGK when I was still with StreetSide and they said the stock replacement were 7's...... Maybe they changed their mind?

    Go Figure.

  8. #6
    cstarky15 is offline Cadillac Owners Fanatic
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    Re: spark plugs

    and what are you gapping them to? .40?

  9. #7
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
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    Re: spark plugs

    Mine are at 35

  10. #8
    TimmyC is offline Cadillac Owners Connoisseur
    Automobile(s): 2006 STS-V and 2007 STS-V The Murdalac
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    Re: spark plugs

    Mine are a little tighter than that from when I had the turbo on it. It was blowing spark out at only 17psi so I put the gaps at 25. I'd change them back to 35 but they are a pain to get out of there just for that.

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