Plug read

[jbailer]

These were my stock plugs re-gapped to .030 with 18,500 miles on them. Any plug experts want to give me a read on these. I think they look pretty good as far as the electrodes and coloring. Any idea why it's black all the way up the threads like that? Possible I didn't torque them down enough? I always use anti-seize on the threads but that only goes up maybe 30-40% of the threads. When I replaced them with the Denso's, I actually used the torque wrench.

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[SYK]

That Looks Really Good To Me

 

[Sgtppr]

They look perfect

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[jbailer]

What about all that black all the way up the threads? What's that?

 

[Juben]

That black on the threads is normal. Why does that concern you? The insulator ceramic and grounding strap look fine as does the rest of the plug. There's no reason for concern, especially if you're using a torque wrench.

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[jbailer]

That black on the threads is normal. Why does that concern you? The insulator ceramic and grounding strap look fine as does the rest of the plug. There's no reason for concern, especially if you're using a torque wrench.

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I used a torque wrench this time because I was worried maybe I didn't tighten them enough last time when I didn't use it and maybe that's why there was oil(?) all the way up the threads. I've never seen that before. Sure a little dark part of the way up the threads but all the way up?

 

[Edkiefer]

I could be wrong, but I am going say the threads are rolled in manufacturing and that is normal to see.
It normal to on some cars to get carbon build up on threads.

From pic as what can be seen, they look fine to me.

 

[jbailer]

I could be wrong, but I am going say the threads are rolled in manufacturing and that is normal to see.
It normal to on some cars to get carbon build up on threads.

From pic as what can be seen, they look fine to me.

It's not carbon build up. I thought it was visible in the picture but it was wet all the way up near the top of the threads. I was thinking oil or maybe the anti-seize I put on the threads at the base of the plugs, not sure if it's the anti-seize why it would be all the way up the threads though.

 

[Edkiefer]

It's not carbon build up. I thought it was visible in the picture but it was wet all the way up near the top of the threads. I was thinking oil or maybe the anti-seize I put on the threads at the base of the plugs, not sure if it's the anti-seize why it would be all the way up the threads though.

Oh, sorry I was concentrating at the electrode end .

Yes, I see what you mean, and it probably is anti-seize . it has very high temp rating (2000F ).
what does it feel like ,maybe anti-seize partly started to separate.

If spark plug wells are dry, I wouldn't worry about it.

 

[wildcatgoal]

The black is anti-seize that's been exposed to heat. Nothing to worry about.

 

[jbailer]

The black is anti-seize that's been exposed to heat. Nothing to worry about.

That's what I was hoping, good to know, thanks!

 

[Diablocoastie]

Yup, the black on the threads is anti-seize. It wouldn't matter if you put it on the very first thread as you screw the spark plug down it spreads upwards. One ingredient in anti- seize is PETROLEUM at least 20-30% and others like calcium oxide and aluminum stuff, haha. If it's the black type it has graphite too. Looks good to me. Hope this helps.

 

[Kjewer1]

I can't see the timing mark from this angle. And all of the threads being black doesn't help determine how you're doing with the heat range. Porcelain coloring, or any other AFR determinations need to be made with only the conditions in question run on the plug. For example, kill the engine after a WOT pull before idle mixture makes it impossible to read the WOT fueling. And that would be down at the base of the insulator. Reading AFR from plugs is mostly unnecessary with a working wideband anyway. So there is really nothing to see here.

 

[BlackBoostedStang]

Noob question, Im sitting at 27k miles, with 2.5k miles on tune. Im going to pull my plugs and have a look. What signs should I look for to make the decision to change them?

 

[Sgtppr]

Noob question, Im sitting at 27k miles, with 2.5k miles on tune. Im going to pull my plugs and have a look. What signs should I look for to make the decision to change them?

Carbon build up or burn marks. Orange tinge is okay

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