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'04 spark plug question

Discussion in '2nd Generation' started by coild, Jan 14, 2010.

  1. coild

    coild Boss 351 to SVT Cobra Established Member

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    Oct 31, 2006
    Location:
    Santa Rosa, CA
    The plugs in my '04 are factory original and the truck has 34,000 miles. I have owned it since it had 20,000 miles and have never checked the plugs for tightness. I know the '03-'04 heads have the nine threads per inch. My question is; do you guys think I should check the plugs to see if they are still nice and tight, or just forget about it since I have never had any problems with popping a plug. Truck is bone stock execpt for a Magnaflow catback. She is my daily driver and is babied all the time, execpt when I feel 'the need for speed'.
     
  2. INFAMOU$

    INFAMOU$ The Infamous Project Established Member

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    Location:
    Dubai, UAE
    Any FI vehicle should have the plugs checked/replaced regularly IMO.
     
  3. pedro1973

    pedro1973 New Member

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    Dec 22, 2009
    Location:
    liverpool tx
    dude u have a nice truck if havent any problems with it dont mess with it i have an 03 sonic blue and havent any problems with the plugs
     
  4. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    It doesn't hurt to check, but it's not something I'd lose sleep over.
     
  5. MaLLo_SVT_150

    MaLLo_SVT_150 New Member Established Member

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    Feb 18, 2009
    Location:
    Augusta Georgia
    is there any specific brand on spark plugs our lightnings should use?
     
  6. coild

    coild Boss 351 to SVT Cobra Established Member

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    Oct 31, 2006
    Location:
    Santa Rosa, CA
    If I were to change them, and since it is bone stock execpt for a catback, I would just go with the factory Autolites.
     
  7. MaLLo_SVT_150

    MaLLo_SVT_150 New Member Established Member

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    cool beans..o'reillys i go! :banana:
     
  8. moon

    moon New Member Established Member

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    Nov 8, 2007
    Location:
    N Florida
    My old chart:

    This plug chart has worked for many L owner's.


     
  9. Scuba-Matt

    Scuba-Matt Boost Freak!!!!!!!! Established Member

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    Location:
    South East Florida
    The factory plugs are good for 75K miles, But it wouldn't hurt to put a fresh set in. Stick with the stock plug for your application. Set gap @ .044 Don't forget to put some antisize on the plug threads before installing them.
    Use the stock Plug MotorCraft Platnum. Autozone sells the pretty cheap.
     
  10. SvtRacing

    SvtRacing New Member Established Member

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    Aug 15, 2009
    Location:
    Waycross, Georgia
    If you are going to the trouble of checking the plugs wouldnt be a bad idea to change them. Use the NGK Tr-6 plugs. They cost about $3.00 a piece and you can get a set of new boots and springs for about $35 to $40. I took my truck to the dyno and descoverd it had bad plugs. I replaced the plugs after dyno. the plugs i took out were autolites and two of them were cracked on each side. My numbers would have been better with good plugs.
     

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