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My car had a bit of a miss when up about 5000-7000rpm. I was due for a spark plug change so figured that was the cause.

Now yet to fire the car up again to see if the new plugs fixed the issue.. but thought I would ask for your opinions with this spark plug from Cyln 4.

DSC07407.jpg

See how one of them seems all oxidised..

any idea what would cause that.. it only happened to one and i have never seen it before.

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https://www.sau.com.au/forums/topic/45036-spark-plug-post-mortum/
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Hmmm...

$16 iridiums too :-(

I had plain NGK BCPR6ES or BCPR7ES coppers and I cracked a whole bunch of the ceramic casings in less than 2,000km - no idea why; these are the same ones that everyone recommends.

I now use those murderously expensive Iriways and they seem ok after a few thousand.

T.

  • 3 weeks later...

Those plugs just look a bit coroded around the thread. Bit of moisture got in there mate. Make sure the new ones are seated properly when installed next time but not too tight of course.

The top and centre electrodes look fine though.

Adrian

  • 3 weeks later...

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