Did you get the correct plugs, and if so, what brand? Some are useless. The best plug is the German plug made by Beru. If you buy from Ford as Motorcraft, it will be the Beru in a Motorcraft ZD1A box for pre 1987 6.9s. If an 87 6.9 it takes a Motorcraft ZD9.
If you bought Champion, Delco, Autolite, or Wellman WAP, you might as well throw your money away. They tend to burn out fast under normal use.
1983 to 1986 6.9s take totally different plugs then then 1987 6.9s.
1983 to 1986 6.9s take:
Delco 8G, Beru 0 100 271 102 or 835MJ or GV835, Bosch 80024, Autolite 1107, Wellman GO80 or dual coil GO88, Champion CH80, Ford and Motorcraft ZD1A or E5TZ12A342B, General Motors 5613680, IH/Navistar - 1804211C2, Lucas/Delphi DS090A, Delphi HDS305.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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