Spark Plugs Gap Settings for a 3.7L

Discussion in 'Frequently Asked Questions' started by lil black liberty, Mar 18, 2010.

  1. Okay Autolite says on their website the gap is .035

    But Autozone wrote down on my box .77 Gap...

    And I can't remember what I gapped my other set of Autolites....Any thoughts on what it should be?
     
  2. mag03kj

    mag03kj Banned

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    Check under the hood i think its like .45 but check under the hood it will tell you!!
     
  3. bmrrwolfe

    bmrrwolfe Full Access Member

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    I think .77 would be way to big lol3.gif
    But I think its .040 :D
     
  4. yellocoyote

    yellocoyote Administrator

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    Correct.
     
  5. tjkj2002

    tjkj2002 Full Access Member

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    Look at your emissions sticker that is on the upper radiator support,it will tell you the correct plug gap for your year.
     
  6. .040 yup thanks
     
  7. spymoto

    spymoto New Member

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    But don't you want to use what the plugs says for gap? And use what the sticker says when using the same oem plug? I would think that not all plugs are the same and a different gap may be needed depending on the plug.

    Please let me know because I just bought the Autolite double platinums and like he said, .035" gap
     
  8. tjkj2002

    tjkj2002 Full Access Member

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    The correct gap for any plug you may put in the 3.7 is the gap stated on your emission sticker on the radiator support.
     
  9. spymoto

    spymoto New Member

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    OK Thanks, Will do!
    I'm very interested to see what the plugs look like so I can get an idea if the previous owner took care of her! All of the fluids are next :party52:
     
  10. Dave

    Dave Administrator Administrator Moderator

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    I pulled my OEM NGK copper core plugs at right around 30,000 miles and the gaps were way off (opened up and worn) so I replaced them.

    Since you just got the jeep, good thing to change all the fluids and plugs and start fresh like you said anyway.

    Dave
     
  11. spymoto

    spymoto New Member

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    Yupers, Changed the plugs today and it had Autolite Single platniums :icon_biggrin: They looked like they were changed not too long ago, 2 had .045 and the rest were at about .040. Changed them anyway and made sure to put anti-seize on them. Now to find out what oil people recomend for the front and rear diffs.
     
  12. MichaelDaws

    MichaelDaws New Member

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    Hey bros,

    Yes, spark plugs there is some confusion with regard to setting and understanding the gap size of them, there, plugs...

    I own a 2002 Jeep Liberty LTD, 64,000 miles (read and weep) work overseas A LOT.
    Truck is in mint condition and was going to change the spark plugs.

    So when I "googled" for help was sent here...don't know if this is the page for this make model of Jeep, but this POST is for Liberty's (3.7 litre V6's) in particular.

    Was going to remove and replace the old spark plugs with the NEW NGK Iridium IX platinum spark plugs and no-one on this page could definitely say what the gaps were so I did some digging...

    1St, called NGK and asked~~~DUH?

    Their suggestion for these type of plugs were as follows (in metric/ in inches): 1.1mm or .044in . ( Personally going with 1.05 and .043)

    BE VERY CAREFUL IF YOU OVER SIZE YOUR PLUG, MEANING BENDING TOO FAR OVER THE METAL PLATE. DO NOT PUT ANYTHING IN BETWEEN THE IRIDIUM CONTACT AND THE METAL PLATE AS IT WILL CRUSH THE IRIDIUM CONTACT. THESE ARE MUCH MORE DELICATE THAN PREVIOUS TYPES OF SPARK PLUGS. BE VERY CAREFUL. TAKE YOUR TIME.

    So hope this helps some people out there with their spark plug gap questions, remember...when in doubt call the manufacturers.


    Info: NGK Iridium IX spark plugs - comes in a 2 pack package / 3 year warranty
    Part #: ZFR6FIX-11
    018-4750-0

    NGK company:

    Technical Support

    1-877-473-6767, prompt #2

    hours: 8:30am - 7:00pm

    Monday-Friday EST

    Cheers, Mike
     
    Last edited: Apr 11, 2019
  13. tommudd

    tommudd Moderator Staff Member Moderator

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    NO NO NO NO NO and NO on the NGK Iridium IX platinum spark plugs,
    3.7s call for and run BEST on NGK copper plugs
    change every 30,000 miles and be good
    DO NOT waste your money on NGK Iridium IX platinum spark plugs.
    PLus as far as Gap, it is right on the radiator cross member in plain site
     
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  14. LibertyTC

    LibertyTC Active Member Staff Member Moderator

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    Yup, Tom knows his stuff.
    Here is my cartoon moment, of my Jeep Running Great!
    [​IMG]
     
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  15. tommudd

    tommudd Moderator Staff Member Moderator

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    Lets hope for one he did not install those NGK Iridium IX platinum spark plugs
    and second he comes back to read this
     
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