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Motor only runs when a spark plug is removed

dimebagbubbadimebagbubba Posts: 1
edited May 2016 in Ford
2002 ford explorer 4.6 won't start unless a spark plug is removed. Coolant busted out up from behind engine. Started running terrible now it won't run unless a spark plug is removed. Why will it only run while a plug is removed?


  • cmhj2000cmhj2000 Se, Pa.Posts: 381
    edited May 2016
    Won't run or won't turn over?

    Coolant "BUSTED" out? Hydro locked? Head gasket? Lots of miles???
  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaPosts: 63,409
    Sure sounds like hydro-locking. Does that spark plug have any sign of coolant on it?

    I also wonder, if not a head gasket, if the valves are not opening on that cylinder for some reason.

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