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Thread: How long do the denso plugs usually last?

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  1. #1
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    How long do the denso plugs usually last?

    Does anyone know how long the denso plugs are supposte to last? I have about 17k on mine and am getting a little cold start stumble. The stumble feels like fouled plugs. It comes and goes, and it just started a couple of days ago. I think its time to buy another set. I havent pulled them yet, just thought i'd ask the group. And this is in dennis' forum because i got them from him, and i feel he knows best.

    Thanks everyone..

    Oh, and thanks dennis for taking care of us.
    Dave

    300a
    production date 06-05-02
    686 of 7838
    Trilogy Supercharged #159
    NV "MARAUDR"

  2. #2
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    Quote Originally Posted by Dave Compson
    Does anyone know how long the denso plugs are supposte to last? I have about 17k on mine and am getting a little cold start stumble. The stumble feels like fouled plugs. It comes and goes, and it just started a couple of days ago. I think its time to buy another set. I havent pulled them yet, just thought i'd ask the group. And this is in dennis' forum because i got them from him, and i feel he knows best.

    Thanks everyone..

    Oh, and thanks dennis for taking care of us.
    I had the cold start stumble at about 4,000 miles on the denso plugs. I thought it was from sitting- I don't use the MM every day. I found some empty highway and did some 120+mph runs and it went away and has never returned. I don't know why it worked but it did. Might be worth a shot.

  3. #3
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    In a couple of hours, i am driving from vegas to san diego. I am sure that will help clean things out a bit. Thanks for the reply.
    Dave

    300a
    production date 06-05-02
    686 of 7838
    Trilogy Supercharged #159
    NV "MARAUDR"

  4. #4
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    Gee, just hate to hear that you HAVE to run it that fast Just what we all need another excuse

  5. #5
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    Pull them and check them. Mine were in bad shape after 12k. One had no electrode left. I posted pics in the gallery back in the day.
    2017 Niro

  6. #6
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    Question

    Quote Originally Posted by CRUZTAKER
    Pull them and check them. Mine were in bad shape after 12k. One had no electrode left. I posted pics in the gallery back in the day.
    I thought that these Denso Plugs were top of the line stuff, why all the shortcomings and short life status ?
    Carlos
    '03 Marauder 300A
    • Built 8-23-02
    • TRADED IN

  7. #7
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    Dennis once said 60K or better, and I've got about 20K on my IT-22ss, no problems to report. But, my MM gets regular exercise in the upper RPMs too. I would think that any carbon build up from low use would kill the Densos.

  8. #8
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    Quote Originally Posted by SergntMac
    Dennis once said 60K or better....
    That's funny! I'm trying to find the thread from last winter regarding the IT-20's, it was either in the thread or a phone call, but I was told otherwise....WAAAAAY otherwise.
    2017 Niro

  9. #9
    Quote Originally Posted by Dave Compson
    Does anyone know how long the denso plugs are supposte to last? I have about 17k on mine and am getting a little cold start stumble. The stumble feels like fouled plugs. It comes and goes, and it just started a couple of days ago. I think its time to buy another set. I havent pulled them yet, just thought i'd ask the group. And this is in dennis' forum because i got them from him, and i feel he knows best.

    Thanks everyone..

    Oh, and thanks dennis for taking care of us.
    The plugs should last 60k they have a warranty if you have problems I will replace them for FREE

  10. #10
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    'NUF SAID!!!!!
    No Marauder

  11. #11
    schuvwj Guest

    Question How long do the denso plugs usually last?

    Nuf said!!!

    What was said?

  12. #12
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    What was said just before I said.....'NUF SAID?????

    Read "Dr. Reinhart's" statement.......I think that should sum it up??

    Does for me anyway!!!

    Marauderjack
    No Marauder

  13. #13
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    Quote Originally Posted by schuvwj
    Nuf said!!!

    What was said?
    Read the post from Dennis!

    Bob, USNavy Retired
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    '03 MM 300A Gone, but not forgotten!
    Born 9/25/02, went home 11/04/02, passed on 3/21/06, Mileage: 100K


    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming...'Wow! What a ride!" (Unknown source)

  14. #14
    schuvwj Guest

    Thumbs down How long do the denso plugs usually last?

    Quote Originally Posted by Murader03
    Read the post from Dennis!
    Mauader03 I read Dennis's statement about the 60,000 mile Denso warranty.
    I bought 8 new Denso's from Dennis last year and logged 9,000 miles on them when several electrods broke off.

    Then why did I have to BUY my Denso replacement plugs from Dennis?
    Warranty? Where!

    This is why I will always use Motorcraft plugs.

  15. #15
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    Thanks dennis, ill pull them and let you know either way.

    Thank you
    Dave

    300a
    production date 06-05-02
    686 of 7838
    Trilogy Supercharged #159
    NV "MARAUDR"

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