Can someone read the strap on this plug??

[mustangman1992]

Hey everyone I am a newbie with this whole plug reading thing. I have an 06 silverado 2500 hd with a single 7665 running between 8 and 10 psi. Ignition is about 14 or 15 degrees. I think the mark on the strap looks a little low as in too much timing. Any input would be greatly appreciated!

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[Rdrnnr]

What are your knock sensors saying? I'm tryin to figure out if that things really even been fired the threads look like it's wayyyy too cold

 

[mustangman1992]

This is a better pic

 

[mustangman1992]

What are your knock sensors saying? I'm tryin to figure out if that things really even been fired the threads look like it's wayyyy too cold

The knock sensors aren't picking up anything. The plug maybe only has 4 miles on it. I beat on it pretty good during that time.

 

[Turbocharged400sbc]

dont read that, thats the haz from the ground strap weld, plating is still intact on the tip, the zinc doesnt bond to the oxidized steel from the strap weld, and its not like they have em acid etched/passivated before plating

 

[Turbocharged400sbc]

go look at a buncha black oxid coated autolite/etc and youll see the ghosting of that ground strap weld HAZ on them as well....right out of the box since the black oxide doesnt hide it like zinc

 

[Rdrnnr]

The knock sensors aren't picking up anything. The plug maybe only has 4 miles on it. I beat on it pretty good during that time.

Then that plugs way too cold it didn't even darken a single thread

 

[Rdrnnr]

Or your knock sensors aren't workin right

 

[mustangman1992]

go look at a buncha black oxid coated autolite/etc and youll see the ghosting of that ground strap weld HAZ on them as well....right out of the box since the black oxide doesnt hide it like zinc

This plug any better? This one had a few more miles on it

 

[Rdrnnr]

This plug any better? This one had a few more miles on it

View attachment 83309

Yes. Looks to me like it wouldn't hurt to drop just one heat range on your plug and they'll be fine

 

[Rdrnnr]

That should shift your swath a lil further out and back your line off your threads by one be sittin perfect. If there's 0 kr where your at now and you know your sensor are functioning correctly send her bud

 

[Turbocharged400sbc]

You can easily make a wooden jig to cut the ground straps back to the edge of the center electrode with a Dremel cutoff wheel
Losing nearly an eighth of an inch strap length can do wonders for preventing glow plug situations

 

[Rdrnnr]

You can easily make a wooden jig to cut the ground straps back to the edge of the center electrode with a Dremel cutoff wheel
Losing nearly an eighth of an inch strap length can do wonders for preventing glow plug situations

I was gonna add that thing looks pretty squished too. I get tight gaps so you don't blow out spark but that curve back in that looks like it got smashed would drive me batshit. This looks to me like the results of a low end gap tool that uses a wire as a reference rather than a progressive flat surface. Probably just my ocd tho

You also want em as open as you can run em without blowin em out for idle quality and a full burn correct? It's not like modern coil systems dont have the firepower when functioning correctly

 

[mustangman1992]

Thanks for all your help guys! Time to do a little bit more playing this weekend..