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Iridium plugs for the 3.5L?

Discussion in '3rd Gen. Tacomas (2016-2023)' started by jdm72670, Nov 16, 2021.

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  1. Nov 16, 2021 at 1:06 PM
    #1
    jdm72670

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    jdm72670 [OP] Active Member

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    So I have a 2020 TRD OFF-ROAD with 65k and an OV tune. Noticed gas mileage is starting to suck by 3-4 mpg worse and a little rough idle. So I’m deciding it’s time to change spark plugs. OEM Densos are $20 each for a standard platinum plug. Do they make iridium plugs for the 3.5’s gen 3, or is a platinum as good as you can get. If ngk or denso offers an iridium plug, does anyone know the plug number and where to order? Up for any and all suggestions.
     
    jdm72670, Nov 16, 2021
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  2. Nov 16, 2021 at 1:07 PM
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    six5crèéd

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    six5crèéd Be the light

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    six5crèéd, Nov 16, 2021
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  3. Nov 16, 2021 at 1:09 PM
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    Tacospike

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    Tacospike Semi-Unknown Custodial Member

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    Might also want to clean MAFS, throttle body and injectors. might be more than just plugs but at 65k could all be a variable
     
    Tacospike, Nov 16, 2021
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  4. Nov 16, 2021 at 1:11 PM
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    Anchovy

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    You can get Denso iridium plugs from advanced auto for $10 a pop. I just changed my plugs last weekend
     
    Anchovy, Nov 16, 2021
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  5. Nov 16, 2021 at 1:11 PM
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    Anchovy

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    Anchovy Rule #1: Never take me seriously

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    Well the plugs are supposed to get changed at 60k. He’s 5k overdue
     
    Anchovy, Nov 16, 2021
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  6. Nov 16, 2021 at 1:12 PM
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    Tacospike

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    Tacospike Semi-Unknown Custodial Member

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    True. Just saying the others could probably be cleaned as well
     
    Tacospike, Nov 16, 2021
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  7. Nov 16, 2021 at 1:13 PM
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    Junkhead

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    Junkhead TRDude

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    Isn’t there only 1 MAF?
     
    Junkhead, Nov 16, 2021
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  8. Nov 16, 2021 at 1:14 PM
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    Anchovy

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    Anchovy Rule #1: Never take me seriously

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    :boink:
     
    Anchovy, Nov 16, 2021
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  9. Nov 16, 2021 at 1:17 PM
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    Travelinman301

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    Travelinman301 4 x 4 Fanatic

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    X2...NGK makes iridium spark plugs for the 3.5. They are a lot more durable than the platinums and hold the proper gap for a lot longer.
     
    Travelinman301, Nov 16, 2021
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  10. Nov 16, 2021 at 1:18 PM
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    ryanvar42

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    Only one MAFucker up in here

    - J to the R O C
     
    ryanvar42, Nov 16, 2021
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  11. Nov 16, 2021 at 1:18 PM
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    Tacospike

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    :rofl:
     
    Tacospike, Nov 16, 2021
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  12. Nov 16, 2021 at 1:19 PM
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    RedWings44

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    RedWings44 Well-Known Member

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    Not sure where you live but don't forget that winter fuels can cause worse MPG.
     
    RedWings44, Nov 16, 2021
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  13. Nov 16, 2021 at 2:17 PM
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    Superdave1.0

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    Superdave1.0 Grandma Dave

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    NGK iridium ix seems to have the top spot. Looking on NGK website and several auto parts sites, I can't find that they make a plug for the 3.5. Seems silly, I would hope they make a plug that applies.

    Denso iridium part # 3491
    Denso TT iridium part # 4705

    Looks like the 3491 part number is the better plug, also costs more. Whatever you do, stick with denso or NGK.
     
    Superdave1.0, Nov 16, 2021
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  14. Nov 16, 2021 at 2:50 PM
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    Mike402

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    Mike402 Well-Known Member

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    I'm impressed you have 65k on a 2020. I've got 25k on my 20 and thought I needed to start cutting back :)
     
    Mike402, Nov 16, 2021
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  15. Nov 16, 2021 at 3:03 PM
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    splitbolt

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    splitbolt, Nov 16, 2021
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  16. Nov 16, 2021 at 3:13 PM
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    MidCitiesMildMan

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    I am at 71k miles on the OE plugs and have noticed no changes in performance or fuel economy.

    They will get changed at 75 or 80k, with the OEM plugs. I won’t own it the next time they get changed.
     
    Last edited: Nov 16, 2021
    MidCitiesMildMan, Nov 16, 2021
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  17. Nov 16, 2021 at 3:55 PM
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    El Cucuy

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    El Cucuy Well-Known Member

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    El Cucuy, Nov 16, 2021
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  18. Nov 16, 2021 at 3:58 PM
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    Smacky2020

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    Holy shitsnacks; I'm barely pushing 8,700 on my '20 thanks to covid. Congrats on getting to drive the crap out of yours!
     
    Smacky2020, Nov 16, 2021
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  19. Nov 16, 2021 at 4:26 PM
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    Junkhead

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    Junkhead TRDude

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    Haha!
     
    Junkhead, Nov 16, 2021
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  20. Nov 16, 2021 at 4:27 PM
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    Junkhead

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    Junkhead TRDude

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    Well, you are not wrong! :rofl:
     
    Junkhead, Nov 16, 2021
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Denso Spark Plug Iridium TT - 4705
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