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My experience with installing iridium plugs in V6

Discussion in '2nd Gen. Tacomas (2005-2015)' started by trd09, Jan 27, 2011.

  1. Jan 27, 2011 at 3:24 PM
    #1
    trd09

    trd09 [OP] Well-Known Member

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    Today at 30,200 miles, I changed the plugs in my 09 4.0 for the first time. I used Chris' writeup as a reference. Excellent guide as always. Took me a little over an hour. It was the easiest spark plug change on a modern car I've ever done.

    Stock plugs looked good. Densos looked better than the NGKs. If I was replacing with the stock copper plugs, get the Densos for sure!

    I decided to get NGK laser iridiums to replace the stock copper plugs (purchased from Amazon, link on bottom). I read the "warnings" about iridiums but figured even if I don't gain power (or even if I lose a HP or two) the extended change interval would be worth it. It's not that I don't like wrenching on my truck, but sometimes it's tough to find time to pull off maintenance in the winter, etc. I hope the plugs will last 100k, but I will check them in 50k or so.

    First impressions- startup is quicker than the stock plugs at 30k. Acceleration around town is a little smoother. In the upper revs it's basically the same. No noticeable loss or gain of power when I dog it, but smoother for sure. No CEL, nothing out of the ordinary.

    If you're thinking about it, consider this as a "success" story.

    Amazon- http://www.amazon.com/gp/product/B001MU29LA/ref=oss_product
     
    Arailt and Alquimista like this.
  2. Jan 27, 2011 at 5:07 PM
    #2
    crf69

    crf69 scraping my emblems off my plasti-dip

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    ummm yeah
    more efficient spark less resistance.....iridiums for the win
     
  3. Jan 27, 2011 at 5:10 PM
    #3
    DriverSound

    DriverSound Señor Member

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    First good thing I've heard about iridiums in the 4.0.
     
  4. Jan 27, 2011 at 5:13 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    In many cases, less resistance can fuck up the ignition. Odds are, the resistance is the same. And as for a "More efficient spark", thats a myth too. All spark plugs sold for a particular make/model vehicle have to meet the same reistance requirements. Iriium, plutonium, unobtainium, whatever. The only difference felt when changing plugs, is the same feeling weather its a copper plug, or other. Its because of going from a worn out plug, to a new one. The only advantage of an iridium plug, is the extended life (claimed) over the nickle/copper plugs. If your going to a colder plug than the OEM plugs, and not force inducted, you could be hurting the engine, as the cooler plug will allow for more carbon build up in the CCs.
     
  5. Jan 27, 2011 at 5:16 PM
    #5
    06TXED

    06TXED Well-Known Member

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    It would be good to know of any other good things about the iridium plugs in the 4.0 V6. It would be nice to only change plugs every 100k . But is sounds like more cons than pros on the iridium plugs. Lets here some more.
     
  6. Jan 27, 2011 at 5:20 PM
    #6
    Dark_Taco

    Dark_Taco ΜΟΛΩΝ ΛΑΒΕ

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    I can find time to change mine every 30K with the densos.
     
  7. Jan 27, 2011 at 5:30 PM
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    Tacomanator

    Tacomanator Boiling denim and bangin whores

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    so you paid over $50 for iridium plugs instead of $20 for stock plugs from the dealer?.... :laugh:
     
  8. Jan 27, 2011 at 5:41 PM
    #8
    SOSHeloPilot

    SOSHeloPilot Well-Known Member

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    Good info here ... I am planning a plug change early ... maybe at 25,000.

    Not using "NGK Laser Iridiums" here ... however deciding if "Dyson" is better than "Denso" or should I use "Hoover" ... :D
    .
     
  9. Jan 27, 2011 at 5:42 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The Denso is a much better spark plug than the Dyson OR the Hoover. However....I dontt think the Denso is any good at vacuuming...
     
  10. Jun 27, 2016 at 5:29 PM
    #10
    yofacemaggot

    yofacemaggot New Member

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    I purchased the ikh20 and just finished the install a few weeks ago. The things I seem to have notice was a better start and smoother acceleration, but that could be the case of the older plugs being used up vs a new plug. Though the one thing I can add is that I got an increase miles per gallon from averaging 290-300 miles a tank to 300-320 miles. Not much of an increase but I do notice that the past few weeks going to work my fuel light doesn't light up at the end of the week. I can make it to the gas station before it lights up now. Than the other question could it be because after 30k miles the engine started to break in properly? I don't know and yet to know. There are alot of factors but so far it seems to be a good value at 60 dollars for 6 vs 24 follows for 6. Including a longer lasting plug. But who knows it's still to early.
     
  11. Jul 1, 2016 at 5:39 AM
    #11
    ARB1977

    ARB1977 Don't be a dick

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    I had Iridiums in my old 3.4L. Pulled them at 60K. Two plugs were worn down to the nub. Although I didn't notice any performance lose.
     
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