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spark plug gap

  1. Non Tuned spark plug gaps

    F150 Ecoboost Maintenance
    I been messing with my spark plug gaps lately. Truck seemed to not be great at .030, so i've been incrementally moving it closer since I have 2 sets of plugs. What is the "hot zone" on some of your un-tuned 3.5L trucks? I'm also talking using Motorcraft plugs, the forum recommended ones. I...