Spark plug suggestions?

This is correct. The OEM Denso iridium is the best way to go. My experience with Toyota is "do what Toyota say's, when Toyota say's" and you will have a vehicle for a long time

 

What he said

 

ok sounds good, thanks for the help.

 

I am in agreement with OEM, where and as practical. It's when Toyota wants a 300% to 400% markup that I balk at this wisdom. It's a fine line between reputation and price, if another has a good rep and its price is down, then by all means buy it over OEM. But if OEM is only a little bit more, I go OEM, as they were designed into the rig.

 

I switched back to the NGK OEM copper cores from the service shop installed NGK’s Iridiums (pictured with only 30k miles).

The copper cores are under $2 each whereas the Iridiums are around $8 each. Huge price difference when multiplied by 8 cylinders!

I also had about 3 cracked coil packs so purchased 8 new direct from Denso for half the cost of OEM Toyota branded Denso.

OEM 2002 manual specs copper core


Iridiums not worth their cost IMO unless your manual specs them.



Denso Coils direct from Big Gurl from Brasil website. Half cost of Toyota Denso.

 

Copper plugs actually conduct electricity better than the iridium but if the manufacturer specs iridium then the vehicle is tuned for the electric of the iridium. Copper plugs should be swapped out around the 30k mark where as the iridium last around 100k. So you really aren't saving any money.
I believe the tundra spec calls for the iridium plugs. The copper plugs will work and will produce a hotter spark and in theory should give you a bump in performance but the CPU may adjust itself and negate that. I dunno.

 

I just changed my plugs using OEM

$4 Denso K20R-U Denso 3122 Spark Plug

Denso K20R-U, and replacing same. Those Denso plugs I replaced looked like the originals, in the sense that their electrodes were worn down considerably with only a tiny bit showing through the porcelain tip - I estimated the gap at around .080, huge by any standard. If those plugs were still firing consistently and no misses, worn as they were, I am sold on them as the ONLY plug to buy for my rig. My rig had 125,000 miles when I changed them out.