Calling all spark plug readers and mystics... Help!!

[Jahdews]

Hey guys, can you all take a look at my spark plugs, and let me know what you think? I just did a plug swap last night, and my truck seems to be running better.

I am looking to see if there is anything seriously wrong. I had a little bit of a miss over the last couple weeks. But like I said, it appears to be remedied by a plug swap.

253,000 miles on the truck.

 

[Doubeleive]

a couple of those look toasty, other than that what do you want to know, plugs are rated for 100k, you didn't say at what mileage they were last changed

 

[OR VietVet]

Like Wes said plus the very top one looks like it has burned oil deposits and the tip is more eaten away. Toasty is a good word. You been adding oil? The bottom one looks like it is starting to do the same thing.

 

[iamdub]

Going out on a limb here, but I'd guess that the one missing the insulator might've contributed to a misfire.

 

[donjetman]

Going out on a limb here, but I'd guess that the one missing the insulator might've contributed to a misfire.

That's what I was kinda thinkin too

 

[donjetman]

A year ago I purchased our 07 Denali with a host of issues. I have fixed them all in 2 mths. Here is a thread I did about the spark plugs:

https://www.tahoeyukonforum.com/threads/sparkies-no-beno.108579/

 

[Antwon]

Did your plugs come pre gapped? What type did you use?

 

[donjetman]

Did your plugs come pre gapped? What type did you use?

Gaps are suppose to be .038". They are usually very close out of the box.

I cleaned those nasty plugs up in my media blaster, gapped them, and put them back in. 20,000 miles and 1 yr later they are still going strong.

 

[91RS]

That top one definitely shows oil consumption.