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Denso plug differences?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by nasaengr, Nov 29, 2018.

  1. Nov 29, 2018 at 2:39 PM
    #1
    nasaengr

    nasaengr [OP] Well-Known Member

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    On Black Friday Advance Auto Parts had a 25% discount and free shipping for online purchases so I ordered 6 Denso 3421 Iridium plugs. They split it in 2 shipments of 3 each; one came from Ohio, the other from Kansas. The boxes looked different, plugs look slightly different. The ones on the left are made in Japan, right side made in USA. Other than the font of the markings and metallic sheen differences they appear to be the same. Debating whether to exchange them at the local store or just put them in.
    Denso.jpg
     
  2. Nov 29, 2018 at 2:41 PM
    #2
    Unchained 5150

    Unchained 5150 Rick

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    Out of curiosity how much was the total shipped price on these?
     
  3. Nov 29, 2018 at 2:44 PM
    #3
    Armed in Utah

    Armed in Utah Well-Known Member

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    why Iridium plugs ? V6 4.0L ?
     
  4. Nov 29, 2018 at 3:07 PM
    #4
    nasaengr

    nasaengr [OP] Well-Known Member

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    $41. Have used them before in the 4.0, and they last twice as long. No noticeable performance difference.
     
  5. Nov 29, 2018 at 3:09 PM
    #5
    Unchained 5150

    Unchained 5150 Rick

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  6. Nov 29, 2018 at 3:41 PM
    #6
    Failure2Comply

    Failure2Comply Old HVACR Tech

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    I run Denso Iridium in my Tacoma and wife's Avalon. For as long as they last to me the cost difference is negligible, and why not run the best? But I would prefer Japanese made over USA.
     
  7. Nov 29, 2018 at 4:17 PM
    #7
    nd4spdbh

    nd4spdbh Well-Known Member

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    gonna get a better spark out of a standard copper plug. Only reason to run irridiums in the single vvti 1gr in our tacomas is if you have a supercharger for longer service intervals as you need to remove the whole super to get to the driver side plugs.
     
    Norton and Hunter4950 like this.
  8. Dec 7, 2018 at 8:32 AM
    #8
    Tectonic

    Tectonic Well-Known Member

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    If I recall correctly, I think our trucks come stock with two different types of spark plugs. I always use the stock denso plugs
     
  9. Dec 7, 2018 at 8:37 AM
    #9
    Armed in Utah

    Armed in Utah Well-Known Member

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    yep NGK & Denso's

    three of each......buy why ?
     
    Norton likes this.
  10. Dec 7, 2018 at 8:40 AM
    #10
    Tectonic

    Tectonic Well-Known Member

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    Who knows... Maybe they got a split-bid with Toyota. Likely a business decision, not engineering
     
    Armed in Utah likes this.
  11. Dec 7, 2018 at 12:09 PM
    #11
    Chuy

    Chuy Well-Known Member

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    2.5 inch lift; 5100's front; OME rear; Air Lift; dual batteries; Bestop bed cover; Nfab nerf steps; EBC rotors; Threadwright Claw MT tires; hood scoop LED light install.
    I'm running those Denso Long Life's (#3421) in my truck. The different country of origin may explain the different packaging but the plugs will be the same. Put the Japanese plugs on one bank, the US on the other; replace in 100K. At about 60K, I replaced my OEM plugs with NGK Iridiums; I ran them for about 115K, and recently replaced them with the Long Life's. I expect the Denso's to last a little longer because they have hardened ground electrodes - that's what wears out on plugs. I recommend you still pull and check the plugs about every 60K to check the gap and other wear and tear. I checked the gap on the NGK's at about 80K and had to re-gap them; they averaged .055 (recommended gap is .043) . I have Iridiums in all my vehicles and they all run as expected.
     
  12. Dec 7, 2018 at 1:06 PM
    #12
    Lester Lugnut

    Lester Lugnut Well-Known Member

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    Last edited: Dec 7, 2018

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