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Thread: New spark plugs needed at 100K miles?

  1. #11
    Grasshopper
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    Quote Originally Posted by Chase300 View Post
    Thus the effect of going from Copper plugs in your '13 to Platinum plugs in the '14 and up models.
    Yeah the last time I changed the plugs in my 2013 I almost changed to platinum plugs, but since I knew I wasn't going to keep my 13 much longer I just went back with the less expensive copper plugs. Now with my new 19 R/T I don't have to worry about it for a while.

  2. #12
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    Quote Originally Posted by DeaconBlue View Post
    With Pentastar V6, if you are going to all the trouble of removing the upper half of the intake manifold to replace the spark plugs (make sure to replace them with the stock long life Iridium plugs) you might as well look into changing the COP's (ignition coils) too, as well as the oil cooler (which tends to develop a crack/leak by about 100K miles). That way you only pay for the labor or spend your own time on this job once. Don't forget to replace those intake manifold gaskets/seals/O-rings when you put the intake manifold back together so you don't develop a vacuum leak later.
    As somebody who purchased the Mopar Lifetime warranty, not sure that approach makes sense for me. The spark plugs are a scheduled maintenance item, but the coils and oil cooler would be covered by warranty. Are the Pentastar coils frequently replaced? It has been 15 years since one of my cars needed a new coil pack, that includes two vehicles that were north of 200K miles without ever replacing a coil.
    Moose135 likes this.

  3. #13
    Durango Jedi
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    I've never had a Mopar coil pack go bad yet..knock on wood.
    '01 over 350K, '06 over 225K...'14 at 90K.

    Either they are working or not...I don't see them degrading over time, so no reason to replace until they actually fail.

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  5. #14
    Durango Expert Pappy35's Avatar
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    I have the Mopar Unlimited mileage plan and I would not proactively replace non-maintenance item parts (unless they are close to what the deductible is). I think those oil coolers are actually fairly inexpensive so, yeah, if I was doing it myself I could see me doing that.
    '17 Durango Citadel, White Knuckle, Tech, and Tow

  6. #15
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    20180717_003344_resized.jpg
    20180717_003047_resized.jpg
    I know this isn't from a Durango, but these are #2 and #3 from wifey's Pilot at 100K... Note the missing porcelain? No doubt, the internals chewed on it for a while. My advice? Hell yea, change them whether they look ok, or not. It's cheap insurance this doesn't happen to your Durango.
    Last edited by NumberThree; Yesterday at 09:21 PM.
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  7. #16
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    Quote Originally Posted by Chase300 View Post
    It is a bit more involved on the Pentastar...I believe it requires removal of the upper intake manifold.
    Hemi is a piece of cake in comparison.
    Yep. Its a PITA. 1/3/5 are easy to get to and 2/4/6 are a beyatch (Or vice versa). I had one go out at 60k and just did them all.

  8. #17
    Grasshopper SteveFoy's Avatar
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    Quote Originally Posted by NumberThree View Post
    20180717_003344_resized.jpg
    20180717_003047_resized.jpg
    I know this isn't from a Durango, but these are #4 and #6 from wifey's Pilot at 100K... Note the missing porcelain? No doubt, the internals chewed on it for a while. My advice? Hell yea, change them whether they look ok, or not. It's cheap insurance this doesn't happen to your Durango.
    Those plugs don’t look right. They look “wet” and the electrodes are all coked up probably from excessive oil. They should be much cleaner looking with a grayish brown color. The electrode should be clean with maybe the tip a little worn away.

  9. #18
    Durango Jedi Don Fox's Avatar
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    X2 on those Pilot plugs looking wet, and I imagine it was burning some oil. Not what I would expect from a properly maintained Honda at 100K.

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    de N8ECH

  10. #19
    Durango Jedi
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    Looks like the Pilot has some oil control issues....I assume its burning oil?
    Have you had the valves adjusted on it?

  11. #20
    Durango Expert NumberThree's Avatar
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    Quote Originally Posted by SteveFoy View Post
    Those plugs don’t look right. They look “wet” and the electrodes are all coked up probably from excessive oil. They should be much cleaner looking with a grayish brown color. The electrode should be clean with maybe the tip a little worn away.
    Quote Originally Posted by Don Fox View Post
    X2 on those Pilot plugs looking wet, and I imagine it was burning some oil. Not what I would expect from a properly maintained Honda at 100K.

    Don
    Quote Originally Posted by Chase300 View Post
    Looks like the Pilot has some oil control issues....I assume its burning oil?
    Have you had the valves adjusted on it?
    EDIT: Had engine upside down. These are the REAR set, so it's Cys#1,2,3 instead of #4,5,6 above

    Reasonable assumptions, and I thought so too, especially knowing that both jugs ate porcelain from the electrode insulators. But to my amazement, it never has used any oil between PMs, and still doesn't.
    I ran a compression test and #3 was only 10lbs low, with the rest about equal (couldn't get it threaded into #1 due to clearance). I wanted to run my bore scope into the cyls to see what kind of damage all that ingested porcelain did to the walls, but same deal --- couldn't get it in there. Just barely could get the plug w/socket in there. There's about as much room as that found on our Pentastars back there.

    My only guess is that these two plugs were not firing properly, or were misfiring and burned rich. Carol never told me the thing ran bad, but she said performance was noticeably better after the new plugs. I told her to pay attention to the oil level, the performance and 'money light'. If they foul any time soon, I'll replace them again, and trade the varmint in on an SRT. She can have my SXT --- Don't tell Carol, but I'm prayin for the money light.
    Last edited by NumberThree; Yesterday at 09:30 PM.
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