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Platinum plugs on a 304?

Discussion in 'Intermediate CJ-5/6/7/8' started by willys59cj5, Feb 19, 2008.

  1. Feb 19, 2008
    willys59cj5

    willys59cj5 Sponsor

    Gilroy, CA
    Joined:
    Jun 1, 2005
    Messages:
    660
    So yesterday I was taking a close look at the jeep and noticed one of the plugs was loose. So I took it out and found that the PO put in platnum plugs. Will these plugs affect this engine in a negative way? My wifes acura didn't call for platinum plugs and with them in it it wouldn't idle correctly......
     
  2. Feb 19, 2008
    farfle

    farfle old dog

    Mariposa, CA
    Joined:
    May 14, 2007
    Messages:
    430
    I doubt you'll have a problem. IIRC platinum supposedly slows electrode wear. This is one of the things that allow for 100,000 mile spark plug changes on some modern engines. A good thing too, cause sometimes plugs require major surgery to replace these days.

    As for your wife's Acrua, again, many modern computer adjusted engines seem to require a certain plug. The computer wants to see a certain value from the plugs, and if not, strange things can happen.
    Modern Harleys with FI can be very plug sensitive, for ex.

    Your 78 has no computer.

    Your 304 could care less, methinks.
     
    Last edited: Feb 19, 2008
  3. Feb 19, 2008
    LarryD

    LarryD Member

    Gallup NM/ 4 Corners
    Joined:
    Jul 7, 2006
    Messages:
    637
    When you say one of the plugs was loose I would think that would be a huge problem, depending on how loose I suspect this would cause a dead miss. Allowed to go uncorrected the spark plug hole would corrode so the spark plug wouldn't seal.
     
  4. Feb 19, 2008
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
    Messages:
    4,275
    One of the primary benefits of the platinum plugs is also that it won't seize into an aluminum head the way a steel plug will. With extended periods between plug changes they can get stuck in there so badly that the head has to be pulled.

    As mentioned, I doubt that your 304 will care. It also has iron heads so no worries on siezing.
     
  5. Feb 19, 2008
    willys59cj5

    willys59cj5 Sponsor

    Gilroy, CA
    Joined:
    Jun 1, 2005
    Messages:
    660
    I don't think the plug has been loose all that long. I was able to unscrew it without a wrench and unspent fuel had made it's way out and around the plug opening. It tightened down fine. I pulled the plug out of curiosity since it was already easily accesible.
     
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