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100K Spark Plugs?

Discussion in 'Ford Trucks' started by FordFisherman, Oct 8, 2008.

  1. FordFisherman

    FordFisherman PlowSite.com Addict
    from 06611
    Messages: 1,593

    Are the spark plugs in a 5.4 really good to 100K? Just turned 75K and I was gonna change em'. The manual says change @ 100K. Seems like thats pushing it to me. Any advice?
  2. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    That's what they say ,but the dealers say change them at 50 because they will get stuck and will cost more in the end with labor to get them out.
  3. hydro_37

    hydro_37 PlowSite Veteran
    from iowa
    Messages: 3,790

    Definatley change them before the 100K. The modular engines have been know to spit a plug occasionaly.
  4. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

    When you change that and you need torque to 7-15 lb ft if you tight too much or loose you will be spit sparkplug anytime.

    Most is best wait until it reach 100K

    but early 5.4L have head that not enough thread for sparkplugs so that why it spit but they redesign in late 2002.
  5. FordFisherman

    FordFisherman PlowSite.com Addict
    from 06611
    Messages: 1,593

    I'll be changing them this weekend- Thanks for the input.
  6. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

    Hope it not spit on that head. Can you check thread before install?
  7. Mark Oomkes

    Mark Oomkes PlowSite Fanatic
    Messages: 10,448

    Only have one vehicle left with spark plugs and they get replaced annually, along with wires, cap, rotor.

    If you are doing any sort of commercial type plowing, you are in the severe duty range of vehicles. I have my transmissions flushed annually, radiators annually, fuel filters at least once a year and quite often air filters. While it may seem overboard, when your company depends on these trucks to make you money, I don't think it is wasted money. Maybe I overmaintain my trucks, but if that's one less thing I have to worry about going bad during a storm, it's worth it.

    Besides, I don't buy the crap they tell you anyways. Ever wait 'til 100K to do a radiator flush? What happens within a month? Water pump needs replacing.
  8. Ford445

    Ford445 Senior Member
    from Vermont
    Messages: 243

    Spark Plugs.......what are those?
  9. cretebaby

    cretebaby PlowSite Veteran
    Messages: 4,162

    i thought all SD were PSD :)
  10. LD4850

    LD4850 Member
    Messages: 64

    I changed my 5.4's at 165,000 Miles & 187,000 miles. Neither one actually needed it but I didn't want to wait until it was cold out to do it.
    The 165 truck now has 202,000 and the 187 one has 221,000 & haven't spit out any plugs yet.
  11. FordFisherman

    FordFisherman PlowSite.com Addict
    from 06611
    Messages: 1,593

    LD, what year trucks do you have?
  12. 93redneck150

    93redneck150 Member
    Messages: 38

    I changed my 02 f-250's at 147,000, no problems, just changed our 97 f-150's at 121,000....