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 - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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