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2003 Explorer 4.0 spark plugs

Discussion in 'Stock 2002 - 2005 Explorers' started by Floridaexplorer43, September 23, 2018.

^^Searches ExplorerForum.com^^





  1. Floridaexplorer43

    Floridaexplorer43 Member

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    Im just shy of 180,000. I don't know what previous owner did or if ever changed. Is Explorer picky on plugs like some vehicles. I read some break off but was under impression that was on the 8 cylinders. I don't think the 4.0 looks too difficult to get to. But havent specifically looked.
     
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  3. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    Soak them for awhile first. At 180k they’ve almost surely been changed.

    I’d use only Motorcraft platinum plugs.
     
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  4. domct203

    domct203 Pilots The Beast Elite Explorer

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  5. Floridaexplorer43

    Floridaexplorer43 Member

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    Soak? I don't know how long they have been in. No response from previois,owner, tried asking yesterday.
     
  6. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    Yeah, spray a little penetrating oil in the plug wells.
     
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  7. vipersinu2

    vipersinu2 Active Member

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    is this the original engine? if not buy the plugs for the year of the engine not the year of the body.
     
  8. Floridaexplorer43

    Floridaexplorer43 Member

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    I don't know no service records from previous R.O.
     
  9. vipersinu2

    vipersinu2 Active Member

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    there should be a serial number on the block, I believe its on the driver side stamped into the block.

    if you can not find the serial number, it no worries, just take a old plug with you to the auto parts store with you and compare the old plug with your new plugs you are going to buy.
     
  10. swshawaii

    swshawaii Elite Explorer

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    Last edited: September 23, 2018
  11. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    Do they change by year on the 4.0s?
     
  12. vipersinu2

    vipersinu2 Active Member

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    I bought plugs for an 03 body but engine was 10. Different plugs. Ran like crap.

    Screenshot_20180923-212009_Chrome.jpg
     
  13. vipersinu2

    vipersinu2 Active Member

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    Third gen didn't get a OHV engine
    Look it up, 03 plugs are different that 2010
     
  14. Floridaexplorer43

    Floridaexplorer43 Member

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    Removed one boot looked in , looks like plug has light blue writing...Autolite?
    May go buy plugs shortly, many plug manufacturers have mixed reviews on antiseize. I bought a beam style torque wrench.
     
  15. donalds

    donalds Elite Explorer

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  16. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    I always use antiseize on plugs and lugs.
     
  17. Floridaexplorer43

    Floridaexplorer43 Member

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    Antiseize same as dielectric grease?

    Is it the 4.0 people have issues with plugs breaking in head?
     
  18. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    No, they aren’t the same. Anti seize on the threads, dielectric on the boots. It’s not very common, but plugs stick in just about every motor from time to time.
     
  19. Floridaexplorer43

    Floridaexplorer43 Member

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    Autozone said my vehicle came with double platinum motorcraft but don't have dp only single platinum for same price so I bought the sp500 B/C "yall" said sp500. Auto Zone had dp in bosch, I said no bosch motorcraft only.
     
    Last edited: September 24, 2018
  20. donalds

    donalds Elite Explorer

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    @Mbrooks420 Ok so I just took your advice on the anti seize
    And dielectric grease

    Took a look at my new engine with 6500 miles roughly
    pulled a plug boot
    No grease wtf
    So I pulled a plug out no anti seize
    My mechanic who dropped in my engine was slacking that day funny he did not mess anything else up ....and I looked
    Don't know why he didn't put that dielectric grease I can see the anti seize tho

    So I spent a half hour pulling all the plugs and put copper anti seize and dielectric grease

    I have to say I expected the plugs to come out easy.....no dice not hard but not smooth I was able to turn them out by hand with a wiggle or two

    However this was a good opportunity to read the plugs which looked perfect at 6500
     
    Last edited: September 24, 2018
  21. Floridaexplorer43

    Floridaexplorer43 Member

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    2003 4.0 is counter closewise to loosen correct?? (Aka lefty loosey)
     

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