Do iridium spark plugs not last long?
- Thread starter The motor guy
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Boats run pig rich when cold. Also any water splashed on the hot ceramic body and cause a micro crack. Find out why they failed, there IS a reason.
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Interesting. Yeah I ran down to autozone at 7:45pm after calling to verify they were in stock and had them installed an hour later after eating dinner. Spark plugs sure are expensive these days. Used to be $2.50 ea now they're like $10 ea
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Wonder why they would make fake spark plugs of all things
07 Yukon Denali 6.2L w/193k miles.
5+ years ago I bought a set of AC Delco #41-962 spark plugs from amazon. 2.5 yrs and 22k miles ago I installed them gapped at .040".
Recently, I've been getting a P0300 code and the engine has had a misfire at idle. It runs great otherwise.
It doesn't set a CEL. I go look for codes with my scanner because of the rough idle.
I pulled a plug and its gap was .065". I pulled the rest of the plugs and they were all .065". All the electrodes had worn badly in only 22k miles. I believed them to be counterfeits.
Went to my local NAPA for my next spark plugs
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I started up the side by side after changing out the spark plugs and it stalled once, then the second time it stayed running. That's how bad it got all of a sudden. Was running fine up until the last two short 10 mile runs down the backroads
I really like the Denso Iridium TT plugs, they are just a hair over $5 per plug on rockauto. I would put them up there with the OEM NGK iridium's in a lot of cars.
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I mean it's mostly covered by the boot
In my experience iridium is totally worth it in cars, and you are better off running standard copper in small engines as they all seem to get fouled up in the same amount of time.. Just my opinion.
$$$$
As you said....plugs now cost upwards of $10 apiece...if they can counterfeit them in China for under $1 each that's a 90+% profit.
Depends on the engine and driving habits. I have cars that eat iridium in 15k. Others that can do 60k.
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What do you do with the ones that wear out at 15k?
Patman
Staff member
I have 155,000 miles on the original iridium plugs in my Civic and the engine is perfectly smooth and my overall average MPG for the last 6000 miles is 49.5. No problem here! 
Garbage can.
Out VW is every 40k and a 2018.
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I meant how is the vehicle operated causing them to wear out so soon.
Turbo engines, hard driving and some blow-by.
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Oh, so it's older and somewhat worn out?
One engine is older. Another that kills them is very fresh, but sees a lot of wot.
130k mornings on my 2012 Honda Fit. Showed almost no wear. Adjusted the valves and replace with Honda Dealer Denso plugs. So I’m good until 250k, except for fluid replacement.
