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Thread: Spark Plug Conditions

  1. #11
    Administrator FSTDANGO3's Avatar
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    They'll seemingly run fine but in reality you'd be stressing out other components of the electrical ignition system.
    I think 30K is best.
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  2. #12
    Durango Jedi Master
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    Those conventional Champions were never designed to run more than 15k at best efficiency. Running them longer could be a contributor to the frequency of coil replacement seen here as the longer the plugs are run, the more spark is needed to jump the plug gap.
    Hanson front bumper, Kennesaw rear bumper, Ranch9000xl's w/ remote, Detroit Locker, lots of other goodies

  3. #13
    Zen
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    I'm gonna check all my plugs this weekend, maybe swap them all out for new just because I have no prior record of service done to the D for the 67k miles I didn't own it. What's the best choice for new plugs, Autolite? What's the proper heat range for the 4.7? TIA!

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  5. #14
    Grasshopper
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    That's not worn? THIS is worn!



    Somewhere around the 90-120K mile mark (from the 4.7L in my old Durango.)
    04 Durango ST 4.7L 125K miles - traded in for:

    04 Durango Limited 5.7L Hemi 35K miles (as of Mar 2012)

  6. #15
    Durango Jedi
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    yes, those are really worn!!
    2003 Dodge Durango 4.7 4x4
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  7. #16
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    03 Owners manual calls for 30K, I found that while looking for the replacement bulbs for the turn signals and CMHSL the other day.

  8. #17
    Durango Guru Siggi Gunda's Avatar
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    Since I live in a small place with ocean all around and my D almost never gets to the right working heat with short streets, I'm always stopping and going and I change my spark plugs once a year. If I don't, my mpg goes down. And talking about mpg going down, I always use Autolite 5224 ones that are for my D. I tried the 3923 and felt the increased power, but the mpg went way down and my 5.9 has more than enough power with the 5224s. What I'm trying to say is, in cold weather and driving short distances that don't get the D up to operating temp, the spark pugs wear out faster. I only drive about 6 to 8k a year.
    Siggi

    Black 2002 Dodge Durango R/T and I love it

  9. #18
    Grasshopper
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    My 07 D manual specifies spark plug changes every 50k kms. I'd like to know if these are based on copper or platinum plugs? Thanks.

  10. #19
    Durango Guru Skippy426's Avatar
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    I replaced my spark plugs on my 5.7 today. Went with Autolite double platinum plugs. Most of my plugs looked okay, though a few had some crusty/ashy stuff on them. But my idle is buttery smooth and there's no more hesitation when I step on it now.


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