Great pictures Pat, thanks.

If this picture could tell a story...

 

Sorry guys. I had my left confused with my other left...
The significant wear was on the DRIVER side...same situation as observed by Mt_Goat.
So the plugs on the left were from the driver side.

Now I have to go put the "Left"/"Right" post-it notes back on my velcro-tie tennis shoes.

 

Good thread. I had to figure this one out myself several years ago with my S/C Tacoma. I tried many different plugs, and had the ritual of pulling platinum plugs out every 2 weeks to clean the extreme fouling off of them. I actually kept 2 "good" sets and would leave one set soaking in carb cleaner while running the other set. What I finally discovered worked well (ran same plugs for more than a year without fouling or pinging) were Denso IK20 irridium plugs. This is only one range cooler than stock, and one range hotter than what Gadget seems to recommend. The way I find the part numbers in the store (to cross reference) the "easy way" is to look for plugs for a Twin Turbo Supra - that'll get my heat range in any brand of plug.

Also, I think it's been mentioned here already, but the waste spark system provides the opposite polarity to the driver's side plugs -- unless you get platinum or irridium plugs with precious metal on the ground electrode(s) as well as the center electrode you will have excessive erosion and the gaps will go out fairly quickly.

 

I just ordered a set of K20TR11 Denso copper plugs from Rockauto.com for $1.80 a piece. One step colder stock plugs. I will change my plugs every year before I spend $10 on one spark plug.

 

Hopefully one step is enough to get away from the ping. Let us know what happens.

 

Keep an eye out for specials on iridium plugs. I was going to keep swapping around some old platinum plugs from my Tacoma (tacoma went back to dealer with iridium in it, should have pulled em out) in my 4runner until I saw the special 2 for 1 on iridium plugs - paid $30 for the new set just before x-mas. Might take a year of looking, but they do go on special.

 

Any updates as to which copper plug to use? My IK22s are already fouling out after a month of use! I'm confused between the 3 different part numbers I see in this thread regarding copper spark plugs.

 

puttin in the IK24-3 steps cooler in 2maro-ill keep yal posted. gapped them to .32
I have a set of new 2step cooler coppers in case they dont work out.

 

What kind of setup are you running?

 

supra injectors, walbro 190, and unichip tuner specific for my current setup

 

I hope you mean .032"

 

check the link below and you will be able to see the difference between them.
http://www.spark-plugs.co.uk/pages/t...ymbol_code.htm

the plugs with single ground straps will foul quicker and the two different copper plugs recommended are similar but I see the only difference is k=projected tip, and p= projected insulator

they both work about the same I will strongly suggest staying away from any single ground plug unless you want them to foul very quickly!!

K20TR11 Denso are a dual ground OEM for Toyota part number 90919-01198. listed http://cgi.ebay.com.sg/DENSO-Japan-c...item3ca8a1a41a

I will say that I get mine at advance auto may have to order to pick up next day but are less than 4.00 ea. bkur7et

 

It could be those plugs are too cold for your setup. Watch this video from post #13: https://www.yotatech.com/51318480-post13.html

If the plugs don't get up to 500*C they can foul quickly.

I don't see the number of ground straps being reliant to fouling, only wear.

 

I've tried both IK-22's and the Denso Copper's in my engine. The IK-22's wear down on the driver's side about every 15-20k miles, but the Copper's fouled easily and couldn't be gapped to the optimum .032"...

So for now I run IK-22's and change them about once a year... it's definitely an imperfect solution though.

 

which copper plugs did you use?? mine have not fouled for a very long time of course I do not have forced air...

 

As I said, Denso Copper's; they had triple ground fingers and a thick center electrode. URD used to sell them, but stopped for some reason (could be they didn't work that great for supercharged guys).

When I installed them I had misfiring at high boost from the get-go, and they ended up fouling much faster than an IK-22.

 

Good to know for you sorry I didn't actually see Denso maybe try the NGK?? Or just go with the IK22.
Mt goat single ground straps will foul out quicker on the ground side maybe not the electrode side...

 

Why?

 

i would've sworn the original (budget) spark plug URD suggested was the Denso 5062. I thought that was the triple electrode copper. All the redirects I saw today make it look like an iridium. odd.

 

You're right, they were the budget option. They're gone now, I suspect because they weren't a good match for us.