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Spark Plug


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#1 vindi93

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Posted 29 September 2016 - 04:45 PM

Ok last month I had a misfire turned out to be the spark plug in cylinder 3, so the garage changed it apparently the prong had disappeared. Had the car back all was well. This week it started again so to save taking back to the garage I bought some plugs. Guess what the plug in cylinder 3 is once again missing its prong??? Anyone have any idea what's causing the prongs to disappear?

#2 DazW

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Posted 29 September 2016 - 05:07 PM

You could really do with seeing the plug, then you can tell if it's broken or burnt away

#3 vindi93

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Posted 29 September 2016 - 10:24 PM

Posted Image

#4 vindi93

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Posted 29 September 2016 - 10:25 PM

As you can see the prong is AWOL I'm suspecting a fueling issue causing excess heat

#5 DazW

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Posted 29 September 2016 - 11:04 PM

If it was excess heat I'd be expecting to see more damage on the electrode too, it's a strange one that I've never seen before, maybe the fitter damaged it setting the gap or fitting it

#6 Deep Blue

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Posted 03 October 2016 - 11:22 AM

I hope its melted away somehow even with the issues that may cause sorting it out. Otherwise you have bits of sparkplug prong floating around in the engine somewhere!!!

#7 vindi93

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Posted 04 October 2016 - 10:17 PM

The electrode tip is made from iridium designed to with stand extreme heat which is why that part may not be affected. The prong is made of some other material which is not as heat tolerant as the tip is. The tip itself is 0.6mm very small.