Me no seeum.
re-rebuild findings - 310K mi. spark plug
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They're in post #6. Now. You're welcome. 
Now I seeum!They're in post #6. Now. You're welcome.
#8 is not that bad... @Rocket Man shows the easy way:
www.tahoeyukonforum.com
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
Changed the oil. 25k on the freshened engine/trans combo. Still mostly stock tune:)
www.tahoeyukonforum.com
See them now. Does not look like a 300k miles plug.
#8 ain’t bad. Unless you throw headers in the mix. Then it’s pull the inner fender liner time.#8 is not that bad... @Rocket Man shows the easy way:
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
Changed the oil. 25k on the freshened engine/trans combo. Still mostly stock tune:)
those shields and #8 are easy with the right tools
the shields can be handled with a set of these, bought the set of 3 orange handled ones from harbor freight probably 20+ years ago, come in handy for all kinds of things
the mildly curved one (far right) is perfect for reaching in and grabbing the shield and walla it is off and out of the way
don't even know how many times that same plier saved me for other things over time
#8 plug just needs a socket adapter i use a adapter to bring it down to 1/4" and then put a breaker over a little 1/4 ratchet and easy as it gets.
the shields can be handled with a set of these, bought the set of 3 orange handled ones from harbor freight probably 20+ years ago, come in handy for all kinds of things
the mildly curved one (far right) is perfect for reaching in and grabbing the shield and walla it is off and out of the way
don't even know how many times that same plier saved me for other things over time
#8 plug just needs a socket adapter i use a adapter to bring it down to 1/4" and then put a breaker over a little 1/4 ratchet and easy as it gets.
OP
OP
denalilex
Full Access Member
i agree - but this was a limo prior to being mine & all service records are in the glove box & on carfax…. plugs were only changed one time …. so it really is lol… i thought the same thing. but compared to the others - it is the worst one. the wire is burnt on the inside also … i try to take care of my engine - i got it with 250 … one iridium spark plug tuneup would add up to those miles. & #8 being acdelco with the iridium GM part # … it’s factory
it definitely looks like it's been in there a long time. I believe mine had 140k on them when I changed them and yours looks more worn down. take a while to do that but honestly I don't think it hurt anything. looks pretty good.
if your missing any of those metal heat shields around the plug wires. I like replacing them. they work very well. probably not 100% needed but I still do.
as for getting to it, I'll share a pic of the only spark plug socket I actually like.. it's a koken, made in Japan. last place left with any sense of craftsmanship in their hand tools. it holds the plug in without the rubber insert that gets lost and without a magnet. their hand tools are like holding jewelry lol. this, I nice flex had 3/8 ratchet and of all things the cheap black, (I can't call them impact) extinctions from harbor freight. it has this little 1in in the kit that I sware comes in handy weekly.
if your missing any of those metal heat shields around the plug wires. I like replacing them. they work very well. probably not 100% needed but I still do.
as for getting to it, I'll share a pic of the only spark plug socket I actually like.. it's a koken, made in Japan. last place left with any sense of craftsmanship in their hand tools. it holds the plug in without the rubber insert that gets lost and without a magnet. their hand tools are like holding jewelry lol. this, I nice flex had 3/8 ratchet and of all things the cheap black, (I can't call them impact) extinctions from harbor freight. it has this little 1in in the kit that I sware comes in handy weekly.
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Those plugs are a B I T CH. I was trained by my dad to do the job COMPLET, so I've cussed all the GM engineers on all my LS motors and my LT motor. With some patience, and good mechanical aptitude it can be done, but sucks.
