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2003 Explorer 4.0 spark plugs

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

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    1. Floridaexplorer43

      Floridaexplorer43 New 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

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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 Elite Explorer

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    5. Floridaexplorer43

      Floridaexplorer43 New 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

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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 New 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 Explorer Addict

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      Last edited: September 23, 2018
    11. Mbrooks420

      Mbrooks420 High Voltage. Elite Explorer

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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 New 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

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

      Floridaexplorer43 New 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

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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 New 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 New Member

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

      donalds Elite Explorer

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      Spark plugs are normal screw threads
       
    23. swshawaii

      swshawaii Explorer Addict

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      [/QUOTE]
      Smart choice. Search Ford forums, Bosch spark plugs are probably the WORST possible choice for these engines.

      Ford has been using the shorter "SP" part number for years, but the "AGSF" number is stamped on the plugs.

      From the O'Reilly's link above:
      .
      From RockAuto:
       
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    24. Floridaexplorer43

      Floridaexplorer43 New Member

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      Smart choice. Search Ford forums, Bosch spark plugs are probably the WORST possible choice for these engines.

      Ford has been using the shorter "SP" part number for years, but the "AGSF" number is stamped on the plugs.

      From the O'Reilly's link above:
      .
      From RockAuto:[/QUOTE]
      My 8th digit is K so it's a flex fuel motor, does Motorcraft make a double platinum? Not sure of difference between sp and dp....but heard of many vehicles being brand picky on some parts.
       
    25. Floridaexplorer43

      Floridaexplorer43 New Member

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      Ok so double platinum just offers more life according to O'Reilly's link.
       
    26. swshawaii

      swshawaii Explorer Addict

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      You're seriously overthinking this. As long as you used the Motorcraft SP500 or Autolite 103 series designed for your 4.0L SOHC's heat range, you're good for another 60,000 miles minimum. IIRC, Autolite uses the "P" designation for single platinum, and the "PP" for double. You've already installed the Motorcraft SP500's, correct? Rest easy, they're the correct OEM plug for your engine.
       

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