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Thread: New to forum, please help with spark plug issue!

  1. #1
    Registered User
    Name: Donald


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    New to forum, please help with spark plug issue!

    Just bought an 07' Harley Davidson Saleen supercharged F-150. 40,000 miles. Truck had been sitting and after I drove it home started to buck on me. I purchased Motor Craft 515 spark plugs and installed them. I didn't reduce the gap and believe they come @ .045. Truck was better at first then engine light with cylinder 4 misfire. Changed that plug again. Fixed problem but truck still isn't running great but no engine light. What should I do? Thinking of buying the Autolite HTO plugs that were in it before I replaced them. Do I have to use the Autolite HTO? Or are they they the best? Also what should I reduce the gap to? Do you think my problem is the .045 gap or the Motorcraft plugs? Please help. Just bought it a week ago and nothing but problems. Thanks. Don

  2. #2
    Registered User
    Name: Justin


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    Does anyone have an answer to an old post? I'm looking for the same.

  3. #3
    Registered User
    Name: Justin


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    Just put Motorcraft in mine 546 and running well.

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