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 - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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