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Old 02-05-2010, 12:48 PM   #1 (permalink)
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are you supposed to gap iridiums?

i have a 1990 toyota celica gt. i just got them NGK laser iridium for it at advance auto store today. i heard you are not suppose to gap iridiums or something? can some one confirm this to me?

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Old 02-05-2010, 01:56 PM   #2 (permalink)
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That is correct, the gap is pre-set, apparently the iridium is thin enough that gaping can scratch it off, or something like that, I think they also have a slightly larger gap, like you would get after a bit of wear on normal plugs.
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Old 02-05-2010, 02:11 PM   #3 (permalink)
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...also, iridium metal is very brittle, and can break very easily, hence the "...don't mess with the gap..." mentality surrounding them.

...unless you have a special gapping tool.

Last edited by gone-ot; 03-19-2010 at 09:57 PM..
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Old 02-05-2010, 03:39 PM   #4 (permalink)
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thanks guys! now i know.. before i had a integra i got these same kind for it and gap it and broke the tip so that is why i had to ask before doing something stupid again.
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Old 03-19-2010, 09:36 PM   #5 (permalink)
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I was going to go for iridiums...
but the single electrode platinums by bosch is on 4 years faultless..even with my goofy fuel air mistakes.

I did not know the iridiums were sensitive..not much talked about.
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Old 03-20-2010, 12:44 AM   #6 (permalink)
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The center electrode on iridium and many platinum plugs is so thin that:

If you gap them, they will break.

That was a bad joke from "Field of Dreams", for those who aren't paying attention.
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Old 03-20-2010, 01:24 AM   #7 (permalink)
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Quote:
Originally Posted by Christ View Post
"If you gap them... they will break."
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Old 03-20-2010, 02:01 AM   #8 (permalink)
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Hacken -

I have them. They com pre-gapped. Do not gap them.

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Old 03-20-2010, 02:23 PM   #9 (permalink)
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Quote:
Originally Posted by cfg83 View Post
They com pre-gapped
...exactly; however, it's a good idea to "check" the gap as rough handling has been known to change the factory gap setting...but, NEVER attempt to re-set iridium gaps yourself unless you have the "proper tool"

...two of our three cars use iridium plugs, and I always "check" the gap setting before installation, but *if* it's incorrect, I just take them back to the dealer and request a new plug.

...I don't own the proper tool, but was able to borrow one once, hence my knowledge of its existance and use. And, "yes," I know about the fragility of the center iridium electrode by BAD experience--I broke one trying to reset the gap...and, since *I* was the one who broke it, I couldn't take it back and ask for a replacement, so I borrowed the proper tool (Champion CT-457).


Last edited by gone-ot; 03-20-2010 at 03:10 PM..
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