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Spark plugs 2008 Taco 4.0L

Discussion in '2nd Gen. Tacomas (2005-2015)' started by kilroy2963, Mar 17, 2023.

  1. Mar 17, 2023 at 6:49 PM
    #1
    kilroy2963

    kilroy2963 [OP] Well-Known Member

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    So I need to replace my spark plugs since Toyota put in copper ones 30k ago. I was thinking of getting the Denso (5344) IKH20 Iridium Power, but Im also considering the Denso (4704) IKH20TT Iridium. Any suggestions??
     
  2. Mar 17, 2023 at 6:54 PM
    #2
    b_r_o

    b_r_o member berries

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    Stick with oem copper
     
  3. Mar 17, 2023 at 6:59 PM
    #3
    kilroy2963

    kilroy2963 [OP] Well-Known Member

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    I wasn't expecting that answer, why when they are worse on longevity, power and fuel efficiency??
     
  4. Mar 17, 2023 at 7:06 PM
    #4
    Dm93

    Dm93 Test Don't Guess

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    Oem copper work best in the 4.0 unless it's boosted, some people have driveability issues running platinum or iridium plugs in the 4.0.
    Many people run the copper plugs for 100k+ without issues but the recommended interval is 30k.
     
  5. Mar 17, 2023 at 10:08 PM
    #5
    azzwethinkweiz

    azzwethinkweiz Well-Known Member

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  6. Mar 18, 2023 at 2:52 AM
    #6
    muddog321

    muddog321 Well-Known Member

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  7. Mar 18, 2023 at 7:17 AM
    #7
    kilroy2963

    kilroy2963 [OP] Well-Known Member

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    Two for and two against, it is a difficult decision, Denso claims they are fine for older vehicles. But I can't afford to do the job twice, so Im leaning towards the standard Denso copper which i know works.
     
    TOMB likes this.
  8. Mar 18, 2023 at 7:42 AM
    #8
    steveo27

    steveo27 Ask me about my weiner

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    The same shit everyone else has.
    Why is it a difficult decision?

    Use the Denso coppers like the engine was designed for.
     
    Last edited: Mar 20, 2023
  9. Mar 18, 2023 at 7:42 AM
    #9
    winkel

    winkel Well-Known Member

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    Do you really only have 30,000 miles on a 2008???

    Copper, but I'll go 50-60,000 miles based on how mine have looked at lower mileage changes.
     
  10. Mar 18, 2023 at 7:55 AM
    #10
    Dalegribble02

    Dalegribble02 Well-Known Member

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    Denso coppers has my vote
     
  11. Mar 18, 2023 at 8:05 AM
    #11
    kilroy2963

    kilroy2963 [OP] Well-Known Member

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    Thats what i plan to do, I can't risk trying the iridium and they cause problems



    I have 66k on it now, I last changed them at 35k, I bought the truck in 2017 with about 34k on it for mileage.
     
  12. Mar 18, 2023 at 11:58 AM
    #12
    CharcoalToy

    CharcoalToy Active Member

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    To be honest I was really concerned about what plugs I put in my truck after 100K on the original and I ended up with the NGK Iridum for the gas milege. I get 19MPG highway or city. I have a 2013 4.0. I don't think what kind of plug is crucial. Just sayin
     
  13. Mar 18, 2023 at 12:50 PM
    #13
    topoutman

    topoutman Well-Known Member

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    For me it’s Copper, because that is what is stated in the manual. I like to keep things simple.
     
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  14. Mar 18, 2023 at 12:51 PM
    #14
    Taco 422

    Taco 422 Well-Known Member

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    Iridium is risky in a stock motor.
     
  15. Mar 18, 2023 at 5:17 PM
    #15
    azzwethinkweiz

    azzwethinkweiz Well-Known Member

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    People are definitely making me question my decisions. I've been lucky I think since I've put iridium's in every Japanese vehicle I've ever owned, including my 2007 Honda Pilot that just crossed half a million miles. My experience has show the iridium's to last 2-3x longer than coppers as far as the gap is concerned after X amount of mileage. To be honest I had never heard about it being bad until this thread. I'll have to do some more reading.
     
  16. Mar 18, 2023 at 5:56 PM
    #16
    deanosaurus

    deanosaurus Caveman

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  17. Mar 18, 2023 at 6:10 PM
    #17
    Taco 422

    Taco 422 Well-Known Member

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    They still get covered in byproducts of combustion and need to be cleaned or replaced.

    read all you want but this is where everyone heads for Toyota advice.
     
    kilroy2963[OP] likes this.
  18. Mar 18, 2023 at 6:11 PM
    #18
    Nateurboy

    Nateurboy Well-Known Member

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    I’ll vouch for the copper plugs too. Bought the truck with 87k, changed the plugs at 150k and they were the original NGK/Denso from the factory. Wasn’t missing or running rough, just thought it may be time.
     
    kilroy2963[OP] likes this.
  19. Mar 18, 2023 at 6:30 PM
    #19
    Steves104x4

    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    13 years, 165k and a set or two of stock plugs I decided to take a chance and buy new (non-oe) Standard Ignition Blue Streak coils. Holy f@@k, what an amazing difference in engine performance! My truck didn’t run this well when it had 5 miles on the clock. So, there’s my 2 cents!
     
  20. Mar 18, 2023 at 6:55 PM
    #20
    Desert Dog

    Desert Dog Well-Known Member

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    Looking for advice? Wait another 30k miles.
    My 07 went 150,000 miles on original plugs and were only replaced then because they were replacing the O2 sensor at same time and in process of checking that saw a few misfire code on ECU but not enough to trigger a separate error code on the dash. I’m now at 225000 miles (75,000 on 2nd set of plugs) and just passed a smog check with no issues. I’ll probably wait until 90,000 on this set of plugs. Nothing wrong with doing it sooner if you got the time and money.
     
    kilroy2963[OP] likes this.

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