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Iridium Spark Plugs... why or why not?

Discussion in 'XJ Technical Chat' started by JustinOther1, Apr 7, 2015.

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  1. Dan Gardner

    Dan Gardner Well-Known Member Premium Member

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    My Toyota with a 2GR-FE engine (with iridium plugs) is coming up on its first factory recommend replacement at 120,000 miles.

    it’s a bear to get at the rear cylinder bank, so it’s a good thing they don’t need replacement very often.

    Another interesting fact is that a buddy has a similar vehicle with same 2GR-FE engine but a few years newer. Toyota changed the replacement interval to 60,000 miles. So maybe the extra-long replacement interval for iridium plugs didn’t go as well as they hoped.
     
    Dan Gardner, Mar 9, 2023
    #21
  2. Jetfixer

    Jetfixer Well-Known Member

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    I have had exactly two times a plug failed in 36 years of working on bikes and cars . Once in my 2011 chevy hhr one platinum plug tip melted off , and one time on my seca still not what happened plug looked okay . When I put an ohm meter it was no good .
     
    Jetfixer, Mar 9, 2023
    #22
    Roast644 likes this.
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Plugs do fail under compression. It’s not very common, but it prefer to replace an inexpensive plug with another inexpensive plug than to spend money on a fancy plug that could fail in the exact same way that an inexpensive plug does.
     
    k-moe, Mar 17, 2023
    #23
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