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3 denso and 3 ngk spark plugs any clues to y?

Discussion in '2nd Gen. Tacomas' started by kauai808boy, Nov 17, 2010.

  1. Nov 17, 2010 at 2:26 AM
    #1
    kauai808boy

    kauai808boy [OP] Active Member

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    icon/fox 3inch lift, flow-master super 40, jba shorty headers
    does anyone kno y toyota use 3 denso and 3 ngk i asked the guys at toyota parts and they dont kno either but its wats there suppose to use wen replacing plugs because i plan on putting better plugs in my tacoma and was just gona put all the same brand but if toyota does this with the stock truck then it must be for some brilliant reason does anybody know anything


    any ideas ?
     
  2. Nov 17, 2010 at 3:29 AM
    #2
    84Hilux

    84Hilux Well-Known Member

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    I have wondered as well- Maybe it has to do with contracts Toyota has with the manufacturers. They might have an agreement to install 50/50. I have heard either set of plugs works fine.
     
  3. Nov 17, 2010 at 3:33 AM
    #3
    brians05taco

    brians05taco Well-Known Member

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    prob assembled in different areas there all like that even some of the first gen too... i went alll ngk
     
  4. Nov 17, 2010 at 3:43 AM
    #4
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    IIRC, someone posted an actual "reason" of some sort explaining this seemingly silly shit but cannot remember what it was.
     
  5. Nov 17, 2010 at 4:11 AM
    #5
    MotoXdoer

    MotoXdoer taco?

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    they come that way from factory. when u get a 30k the switch to denso..
     
  6. Nov 17, 2010 at 4:16 AM
    #6
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    Yes, but the reason is......???????
     
  7. Nov 17, 2010 at 4:24 AM
    #7
    MotoXdoer

    MotoXdoer taco?

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    i heard from the dealer they put them in that way for the engines break in process, then at 30k service they switch to irridium denso. i thought the same thing, come to find out mine hadnt been changed til 90k when i did the service
     
  8. Nov 17, 2010 at 6:50 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    The spark has nothing to do with the break in. Nor does the dealer switch to iridium plugs at 30k miles. The Manual calls for a nickle/copper plug. The only reason I (and some friends) have comeup with as to why they (Toyota) does this, is because one side of the engine requires a plug with less resistance, so to save a few bucks, they throw in different plugs on one side. Maybe only a few cents savings, but times a few hundred thousand vehicles, the savings most certainly adds up.
     
  9. Nov 17, 2010 at 8:50 AM
    #9
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    Which leads to the next question........Why would the engine need less resistance on one side?
     
  10. Nov 17, 2010 at 8:53 AM
    #10
    Brunes

    Brunes abides. Staff Member

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    Could be timing control or EMI prevention. Kinda like how surround sound systems delay signals to the close speakers so the distant speakers have time to catch up (on the order of milliseconds..so not a huge deal)
     
  11. Nov 17, 2010 at 8:58 AM
    #11
    trd09

    trd09 Well-Known Member

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    not saying this is the reason, but from an economic perspective, having multiple suppliers is a good thing. a few years ago a japanese piston ring manufacturer was affected by an earthquake and a bunch of auto plants had to shut down because they didn't receive piston rings. having two vendors is a smart idea because lets say there was a delivery problem on the ngk side, there is still a supply of denso allowing production to continue.
     
  12. Nov 30, 2010 at 7:47 AM
    #12
    DR1V3RX

    DR1V3RX Member

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    NGK irridium Spark plug rock! jejejeje, combined with NGK performance wiring...
    Engine will run smoother and you will not need to gun it when getting in the HWY.
     
  13. Nov 30, 2010 at 7:49 AM
    #13
    aficianado

    aficianado Well-Known Member

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    i have a friend that is an engineer with the tacoma group. he said he works on the interior, but his friends are in the engine dept. i asked him when he came into town for thanksgiving. he promised to ask around, and hopefully come back with a sensible answer. he flew back to san antonio yesterday.

    i'll post up if/when i find out.
     
  14. Nov 30, 2010 at 7:56 AM
    #14
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Don't think about it too much. You might hurt yourself.
     
  15. Nov 30, 2010 at 8:37 AM
    #15
    borderbrat

    borderbrat Watching Chris4x4 o.O

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    equal opportunity
     
  16. Nov 30, 2010 at 8:44 AM
    #16
    chacotaco

    chacotaco Well-Known Member

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    There are lots of threads on this. Just the way it is.
     
  17. Nov 30, 2010 at 8:56 AM
    #17
    joerussell610

    joerussell610 When all else fails read the directions

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    NO NO NO do not put those plugs in! Just put the standard type in. Get them from Toyota. They are already gapped. Worked for Toyota as a service advisor for years. USE TOYOTA PARTS!!!
     
  18. Nov 30, 2010 at 9:13 AM
    #18
    borderbrat

    borderbrat Watching Chris4x4 o.O

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    meh a plugs a plug. As long as you use the same type and they are gapped properly you're fine. You dont HAVE to buy your plugs from toyota. I have heard of some problems with the iridiums in the v6 though.
     
  19. Nov 30, 2010 at 9:38 AM
    #19
    macgyver

    macgyver Well-Known Member

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    Agreed, the plus aren't made by toyota, they are made by NGK and Denso...whats the difference in buying the same plug from an auto parts store vs. the dealership....oh wait I know...THE SAME PLUG costs much more at the dealership.

    I like to use mostly OEM parts when I work on vehicles however I am not going to get ass-raped by a dealership when I can get THE SAME PART somewhere else for much cheaper. Not to mention our parts department at my local dealer closes at 6pm which means I have to leave work early to get there before they close if I need a part.
     
  20. Nov 30, 2010 at 9:44 AM
    #20
    05Moose

    05Moose Middle-Aged Member

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    I'd like to hear what he has to say. My dad's a retired Toyota mechanic and he said all the V6's in every Toyota model came that way even in the 90's. So it goes back at least a couple of decades now. He said it had something to do with supplier contracts and figured it was a sure way to guarantee they used an equal number from both. But I don't know where he heard it from and whether that is true or not.
     
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