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Do these spark plugs look normal for 40K?

Discussion in '4 Cylinder' started by BBYE V8, May 20, 2012.

  1. May 20, 2012 at 1:06 AM
    #1
    BBYE V8

    BBYE V8 [OP] Please keep TW beautiful: search & stay on topic

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    I pulled the spark plugs today to put some anti-sieze compound on the threads. It's just a simple safe thing to do if I'm going to run these plugs to the recommended 100K miles. Everything seems fine with the truck as well as the spark plugs, except for the way the porcelain looks kinda burnt:


    [​IMG]

    Is this a common, harmless event with the 2TR or the Denso plugs? Or is it a problem? And after only 40K miles? Given how cheap they are, I'm leaning towards replacing them just for peace of mind. But I'd like to know what, if anything, is wrong here.

    .
     
  2. May 20, 2012 at 1:13 AM
    #2
    krimson

    krimson Nothin

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    It's common, the burnt part of the porcelain is no longer sealed to the metal part. It's A good idea to change spark plugs at 30k miles.
     
  3. May 20, 2012 at 6:43 AM
    #3
    george3

    george3 Well-Known Member

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    I think you have a good idea "to put some anti-sieze compound on the threads" 2.7's with iridium plugs are supposed to be good for 100,000. The guys that are saying change them at 30,000 have 4.0 and they are correct for that motor. 100,000 is scary just because they could be welded in by then so the anti-sieze compound at 40,000 should solve that problem.
     
  4. May 21, 2012 at 7:29 AM
    #4
    2004TacomaSR5

    2004TacomaSR5 Well-Known Member

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    That is the cleanest looking spark plug tip I have ever seen! But that is coming from a guy that has only changed plugs on carbureted motors where a lot more carbon and gunk build up on the plugs, I have never changed a fuel injected plug before. I think they recommend you change the plugs every 100k on these trucks, not sure though.
     
  5. May 21, 2012 at 7:33 AM
    #5
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    x2, 30k mile interval is for the V6 engine.

    Those look a lot better than mine did at 40k miles (I have a V6 and should have changed them at 30k miles :eek:).
     
  6. May 21, 2012 at 7:56 PM
    #6
    BBYE V8

    BBYE V8 [OP] Please keep TW beautiful: search & stay on topic

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    Thanks for that...I googled that phrase and found a bit more. Glad to know nothing is wrong. I've had old plugs with a small tan ring around them, but nothing like this big dark brown/burnt oil stain.
     
  7. May 21, 2012 at 8:00 PM
    #7
    Rich91710

    Rich91710 Well-Known Member

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    Ya, that's corona.
    The clue is the "looping" you can see in the ghosting of the stain.
    That is the corona being affected by the magnetism in the steel shell.

    Had that not been present, and had that been a Champion plug, I'd have said that the plug has broken it's seal and should be replaced.

    But I've never heard of Denso having problems with seals.
     
  8. May 22, 2012 at 11:14 AM
    #8
    DGXR

    DGXR Well-Known Member

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    Don't they put anti-seize on the plugs at the factory? My 2TR has 70k miles and runs perfect, so I hadn't planned on taking the plugs out before the 100k recommended replacement... unless there might be an issue getting them out of the head...?
     
  9. May 22, 2012 at 6:55 PM
    #9
    afd23a

    afd23a Well-Known Member

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    I replaced mine at 100k with no problems whatsoever and they looked almost exactly like that. There was no difference in how the truck ran after I changed them.
     
  10. May 23, 2012 at 12:05 AM
    #10
    george3

    george3 Well-Known Member

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    That's good info. How was the gap:confused:
     
  11. May 23, 2012 at 7:15 PM
    #11
    afd23a

    afd23a Well-Known Member

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    Sorry don't remember. It's been 25k ago.
     
  12. May 24, 2012 at 10:09 AM
    #12
    george3

    george3 Well-Known Member

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    OK. Did you regap them or just put them back in ?
     
  13. May 24, 2012 at 4:09 PM
    #13
    afd23a

    afd23a Well-Known Member

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    I replaced them with new OEM Denso Iridiums. Checked the gap on the new ones and they were pretty close to spec. Can't remember what the spec is though.
     
  14. May 24, 2012 at 4:13 PM
    #14
    george3

    george3 Well-Known Member

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    Since they came out without a problem do you think you will wait til 100,000 next time:confused:
     
  15. May 24, 2012 at 6:25 PM
    #15
    afd23a

    afd23a Well-Known Member

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    Yep, that's the plan.:)
     
  16. May 25, 2012 at 2:40 AM
    #16
    george3

    george3 Well-Known Member

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    Thanks. I was going to take mine out to make sure they didn't get "welded" in but with the benefit of your experience I don't think I'll bother til 100,000.
     
  17. May 25, 2012 at 10:23 AM
    #17
    Rich91710

    Rich91710 Well-Known Member

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    Wife's '04 Rav4 was fine at 100k.

    Parts guy at the dealership actually tried to talk me into the cheaper plugs. Told him I don't mind the extra cost for the infrequent changes.
     
  18. May 25, 2012 at 10:52 AM
    #18
    george3

    george3 Well-Known Member

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    Agreed. Your time - my time is worth more then the extra charge.
     
  19. May 29, 2012 at 7:04 PM
    #19
    BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

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    Platinum tip or iridium tip plugs are fully able to last for 100k miles. While there is no need to replace them at 30k at all, it is not a bad idea to apply anti-size on the threads. Just make ABSOLUTELY sure that you don't get any on the tip.
     
  20. Dec 26, 2012 at 7:29 PM
    #20
    canucktacoma

    canucktacoma Active Member

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    i pulled my iridium@130km,,came out easy but i chkd gap,rifght on money,,hard to believe dealer about the 192km srvc,put anti seize to make life easier later..were very clean.
     
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