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Old 07-27-2003, 04:01 PM   #1
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Default How to read plugs...

How do I read spark plugs? I just put in some Autolite 5245'*. My iridiums I took out were sooty around the edge, with a definate line where the outer electrode meets the edge, then they were yellowish/pinkish on both electrodes and the ceramic at the base of the center 'trode was yellowed. A couple had some yellowish "crust" around the edges with the sootiness.
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Old 07-27-2003, 06:08 PM   #2
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go to this link, it has pics and decriptions of plugs and conditions/
hope this helps
http://www.hioutput.com/tech/plug.html
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Old 07-27-2003, 08:07 PM   #3
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I replaced my stock NGKs in my 99 SSEi over the weekend, they looked great. I replaced them with the AC branded NGKs. Part number 41-101 of any one needs it.

I also replaced the stock 41-921'* in my dads 96 Ultra this weekend. They also looked normal, great to see both 3800 */C'* are running great!

Jay
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Old 07-28-2003, 03:52 AM   #4
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By that chart, I would have to go with normal. Good...
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Old 07-28-2003, 07:53 AM   #5
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with you description and not seeing the plugs, it sounded normal to me too. i hope the chart helped. i have it added to my favs.
i make sure i pull a plug after every pass just to see whats going on in there
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Old 07-28-2003, 08:32 AM   #6
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Quote:
Originally Posted by jeffrey10x2
go to this link, it has pics and decriptions of plugs and conditions/
hope this helps
http://www.hioutput.com/tech/plug.html
Awesome link!! That'* the one thing my Chiltons was missing Glad I peeked in here, even though I don't have a SC.
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Old 07-28-2003, 06:17 PM   #7
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plug reading is used in all engines to gain the best performance
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