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Thread: FLEX spark plugs

  1. #1
    Join Date
    Apr 2018
    Ustroń, Poland, Europe

    Default FLEX spark plugs

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


    I find some cross for flex spark plug:


    Which You can recommend ?
    '09 Grand Marquis LS - Light Ice Blue exterior, Medium Light Sone interior, Heated seats, 17" rims, J-mod, dual exhaust with Magnaflow 11224 mufllers

  2. #2
    Road Warrior Kodachrome Wolf's Avatar
    Join Date
    Nov 2014
    Evans, GA


    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:
    -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
    -1989 Sable LS Wagon (88,710 Miles) - Sold
    -1997 Grand Marquis LS (210K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

  3. #3
    Stow It! GM_Guy's Avatar
    Join Date
    Sep 2008
    Ontario, Canada


    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.


  4. #4
    I post a lot...
    Join Date
    Dec 2011
    Yonkers NY


    Good info as one day I may have to change plugs in the TC.
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
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