Iridium Spark Plug Question
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This is a discussion on Iridium Spark Plug Question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a stock 04 WRX and am replacing the spark plugs in the next few days. I have been ...

  1. #1
    Registered User oregonfelder's Avatar
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    Iridium Spark Plug Question

    I have a stock 04 WRX and am replacing the spark plugs in the next few days. I have been given 3 different options for plugs; regular NGK's, platinum NGK's, or Denso Iridium's. the Denso's i bought say 0.4mm. Can you gap iridium plugs or are the pre set? .4mm seems a little big of a gap to me and I'm debating on just having the platinum's ordered instead.

    the first plugs I bought were the NGK's for the 2.5 non turbo...would those have hurt my engine?
    Grand Masta Sexy

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    He simply abides. SD_GR's Avatar
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    You asked whether iridium plugs can be gapped. I'm not going to answer that. Instead I'll answer whether iridium plugs should be gapped. That answer is no. NGK state this outright in their info material on the iridium products. They also state that there is no warranty on damaged iridium electrodes.
    http://www.ngk.com/glossary.asp?kw=S...s?&manID=1&pt=

    If you want to gap them you might try this method:
    http://www.ngk.com/glossary.asp?kw=P...20Gapping&pt=1

    Denso state that their iridium product compensates {sic} for smaller gaps that correspond to other plugs, i.e. platinum.
    Last edited by SD_GR; 11-17-2010 at 06:09 PM.
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  4. #3
    Registered User d_Ziggy_2000's Avatar
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    I did the iridiums and didn't gap them cuz they said not to and it runs amazing
    '88 Sub Justy *Rock in oil pan killed on freeway
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    Registered User oregonfelder's Avatar
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    now does the .4mm mean the gap size or the size of the electrode??? I stumbled across an autolite .6mm iridium plug advertising page and the number caught my eye.
    Grand Masta Sexy

  6. #5
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Quote Originally Posted by oregonfelder View Post
    now does the .4mm mean the gap size or the size of the electrode??? I stumbled across an autolite .6mm iridium plug advertising page and the number caught my eye.
    That's the electrode size. Gapping is usually measured in the thousandths, not the tenths, of millimeters.
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    Moderator T0rque's Avatar
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    I wouldn't of bought the densos..


    Lead Wrench @ WTF Tuning, LLC

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