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    FLEX spark plugs

    I find that Flex engines had different spark plugs, compare to regular engines:

    https://www.fordpartsshop.com/v-2009...gnition-system

    I find some cross for flex spark plug:

    http://www.sparkplug-crossreference....T_PN/AGSF22FM1

    Which You can recommend ?
    '09 Grand Marquis LS - Light Ice Blue / Medium Light Stone, J-mod, dual exhaust with Magnaflow 11224, PI intake, Marty's tune

    #2
    The heat ranges are different for the Flex/Non-Flex fuel engines.

    I’d recommend using the correct plug for your engine to keep things working as designed.


    My Cars:
    -1964 Comet 202 (116K Miles) - Long Term Project
    -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
    -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
    -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

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      #3
      The flex engine uses one heat range colder than regular 4.6's. If you NEVER plan on running E85 (or some other gas with a higher than normal composition of ethanol) you can run the plugs speced for the regular 4.6. I run NGK TR55GP's in my flex.

      Alex.

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        #4
        Good info as one day I may have to change plugs in the TC.
        03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
        02 SL500 Silver Arrow
        08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
        12 Escape Limited V6 AWD, 225/65R17 Vredestein Quatrac Pro, Winter 235/70-16 Conti Viking Contact7 Mods>Beamtech LED headlight bulbs, Husky floor liners

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