So I changed out my spark plugs today

Finally warmed up enough to change out the spark plugs and do a minor tune-up. I do believe they were the original factory plugs, as in never changed by previous owner, see pix. Warn down like crazy but no signs of anything bad. Taco has 122k, 4k of which is mine. Cleaned MAF and throttle body as well. Purrs like a kitten.

The first photo is of plug #2 the worst warn one.

 

mine looked very similar to yours and like you i didn't have any record of previous owner(s) changing them. I'd assume some one would have had to though. i don't think these plugs can last over 100k, but maybe they can i dont know

 

Wow, looking at those plugs, you should get a lot better gas mileage now!

 

If the 2.7 is like the 5vz, the plugs it requires are dual electrode.

 

I guess the don't require a dual electrode plug Tacomadude, picked up the oem denso plugs at my local toyota dealer and they were standard electrode copper plugs. Drove her about 35 miles to work today and she purrs like a kitten now. Rough idle gone starts hella quicker too.