What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[avalonandl]

The plug fought me all the way reinstalling it... didn't have a new one.

old gunk in threads... was really wondering if I could get it to thread.

I suspect this is why my highway mpg is only 16.....old plugs not giving me power in V4 mode.

 

[wjburken]

The plug fought me all the way reinstalling it... didn't have a new one.

old gunk in threads... was really wondering if I could get it to thread.

I am assuming you are doing this when the engine is cold.
I put a small amount of anti-seize on the plug before I install a plug. It provides a little lubrication going in and helps down the road when you need to remove it.

 

[swathdiver]

Earlier in this thread I asked what were the chances of having orignal plugs and wires. Well today I pulled # 1 plug drivers side. Wire came off easily. OK good.

Plug fought me all the way out.... not cross threaded just gunkky threads...View attachment 228372 View attachment 228373
OOOPS looks original to me..... 135 k miles

Interseting its the 41-110 EDIT IRIDIUM

ACDELCO has rebates on IRIDIUMS $3 ea.

What says the TY forum braintrust ?

Those are original, get some new ones with the same PN# and get OE wires, should be 748UU but double check on ACDelco's website:

https://parts-catalog.acdelco.com/catalog/catalog_search.php

 

[swathdiver]

I am assuming you are doing this when the engine is cold.
I put a small amount of anti-seize on the plug before I install a plug. It provides a little lubrication going in and helps down the road when you need to remove it.

Yep, and dielectric grease on the electrical contacts, both ends of the wires.

 

[CHOO CHOO]

Just shove it in dry......[emoji41]

 

[Rocket Man]

The plug fought me all the way reinstalling it... didn't have a new one.

old gunk in threads... was really wondering if I could get it to thread.

I suspect this is why my highway mpg is only 16.....old plugs not giving me power in V4 mode.

Gotta be careful with our aluminum heads, it’s way too easy to strip them out. Like others have said, use anti seize but why did you not have new plugs to install?

 

[Doubeleive]

What do you think?

 

[R3cord303]

What do you think?

View attachment 228410

looks like good arse plugs

 

[Doubeleive]

Here's another one, my under 40k plugs look like the135k one posted earlier

 

[Fless]

Here's another one, my under 40k plugs look like the135k one posted earlier

Yours are not anywhere near as bad as the 135k ones...