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7.3 knocking

  1. 1993 F350 Non - Turbo Knocking

    Testing Forum
    Hello Everyone! Yesterday I replaced the fuel filter on 1993 F350 7.3 non-turbo. Today, I was going about 65mph when i heard a loud knock develop in the motor. The truck now idles very rough too. Considering I went to town to top off the fuel, could that be a factor? In reading on here, I...
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