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Old 06-23-2013, 10:34 PM   #1
Bell040


 
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spark plug on #4 cylider looks bad... why?

I was changing my spark plugs today to the LS7/LS9 plugs (AC Delco 104's).


When I was removing the stock plugs I noticed excessive wear on the spark plug in the #4 cylinder. Like so:

Top = new 104 plug
Middle = old 110 plugs (this one looks similar to the ones from all other cylinders)
Bottom = old 110 plug from cylinder #4 (I am guessing that a .087 gap is bad)






What is causing this?

Info about my car:

-about 140,000 total miles, about 70K of those are on the cam in my sig (all on the same 110 plugs)
-no CEL because of misfire
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Old 06-23-2013, 10:36 PM   #2
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looks like the tip failed and it just snowballed. dont see any ash on it just excessive soot
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Old 06-23-2013, 10:42 PM   #3
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So .... nothing to worry about?
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Old 06-23-2013, 10:46 PM   #4
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that doesnt look ok to me.........
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Old 06-23-2013, 11:21 PM   #5
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Quote:
Originally Posted by BLACK10 View Post
that doesnt look ok to me.........
That's what I was thinking, but what is not okay?

Will the new plug fix the problem? ... or is it possible that something is wrong with that cylinder system (injector, valve, leak, etc)?
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Old 06-23-2013, 11:26 PM   #6
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hard to tell from a pic, but looks really black. so how many miles on that plug?
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Old 06-23-2013, 11:36 PM   #7
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Quote:
Originally Posted by BLACK10 View Post
hard to tell from a pic, but looks really black. so how many miles on that plug?
140,000


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Old 06-24-2013, 12:09 AM   #8
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So .... nothing to worry about?
i would be really worried. i would check my plugs everyday and take it to my tuner. my tuner wouldnt be ok with it either. something went wrong. hope its a bad plug.
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Old 06-24-2013, 04:46 AM   #9
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Could be some detonation caused that tip to fail sometime along the way, but 140k on a set of plugs? Sheesh. Who knows if or when.
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Old 06-24-2013, 05:41 AM   #10
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Looks like #4 may be taking on some oil? Could be why the tip is missing, from detonation.
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Old 06-24-2013, 10:40 AM   #11
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Quote:
Originally Posted by SPCBA View Post
i would be really worried. i would check my plugs everyday and take it to my tuner. my tuner wouldnt be ok with it either. something went wrong. hope its a bad plug.
I can pull #4 every week or so to check. Every day is not feasible, as life still happens. It is too bad that #4 is by far the hardest plug to pull.

Quote:
Originally Posted by Iam Broke View Post
Could be some detonation caused that tip to fail sometime along the way, but 140k on a set of plugs? Sheesh. Who knows if or when.
I had them out at ~70K (during cam swap) and they were fine.

Quote:
Originally Posted by Criag B View Post
Looks like #4 may be taking on some oil? Could be why the tip is missing, from detonation.
I guess there is no way to check this? ... without pulling the heads anyway


Question is... why was there no CEL due to misfire?
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Old 06-24-2013, 10:57 AM   #12
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Oil won't make the tip wear away like that. But with 140k, hard to say what's happened there. To me in looks like the ceramic is gone, and that usually happens to to an ultra-lean condition (bad/plugged injector), detonation, or the plug got really hot for some reason.

You don't mention any other underlying symptoms, but I would at the very least run a compression check to make sure all is even. If it's okay, put in your new plugs and see how it runs. If it runs okay, give it some hard pulls and take out #4 and another plug for comparison. If all looks good, put it back together and check that plug occasionally for any abnormalities.
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Old 06-24-2013, 11:04 AM   #13
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So you've ran a spark plug for a total of 140k miles? Or 70k after the cam?

Either way that's crazy intervals. Your lucky the others don't look the same way.
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Old 06-24-2013, 11:20 AM   #14
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Is that header tube the same color as the rest?
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