I have not had any problems with the 6 but i have also not pulled them to see what they look like yet either.

I am taking my experience from MR2's any applying it to the 4runner. In the MR2 if you use 2 steps colder the plugs get fouled VERY fast. Usually you get reduced performance within a few hundred miles.

I am running water/meth injection though so not sure how a 1 step colder would work without that. I plan to stick with 1 step colder plugs in my truck though unless these plugs look like they are too hot when i pull them out.

I doubt you'll have fouling with water/meth injection. I don't with IK22s and they are 2 steps cooler, just lots of wear.

I ordered up 6 NGK BKR6EK PB-11 to try. They are double platinum plugs (2 ground straps which are platinum tipped also), they are expensive at $10 each and a step hotter than I'd prefer but there just isn't a good choice for a 2 step cooler plug for the 5VZFE IMHO. Very frustrating but hopefully these will work out.

You run water injection right? you should be ok, if you were on plain gas and pullyed think i would stick to 2 steps cooler till it is proven ok on plain pump gas.

Yes, 50/50 water/meth Aquamist 2D system.

Old system but as long as it is working i doubt you will have any problems.

Yeah getting old, like me lol...funny you should say as long as its working, I've had 2 leaks this year. I guess I need to replace all of the lines.

Dale,

I thought you were looking into getting some Denso plugs from overseas? Did that never materialize?

BTW, where have you been hiding out? Somewhere that has AC hopefully. A friend in Tulsa says hell has nothing on the hot heat in OK at the moment.

Yeah I can't bring myself to buy plugs in some foreign currency and pay God knows what in shipping.

Yeah what a heat wave, but I just got back from Breckenridge CO and 2 trails had so much snow I couldn't get through to the top. Nice a cool up there (about 10,000 ft).

New plugs are ready to go in, I like that the tip (top) doesn't unscrew. Some have reported the tips unscrewing during use and causing problems (other types of plugs)

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Those may have been the plugs i used last, i know i ran some plugs like that at some point. Worked fine for me but still didn't last all that long but i am real picky about my plugs.

Just changed mine last weekend for the first time in over 130K and they didn't look that bad.






Or that good.

Actually they do look real bad, look at those gaps!

Well, they look pretty good for 130K! Seriously, those were toast a long time ago.

Yeah, for 130k i guess they could be worse although not sure how much worse.

Bet that truck drives like new after that change!

do i ever need to do this asap... thanks for the prodding folks!

So which ones should I use with a stock 02 3.4? NKG or Denso? I have a Napa and Toyota dealership right next to each other.

Doesn't really matter on a stock truck long as you change them out.

I usually buy ngks. Its so easy to change them out there really is no excuse. Unlike the rear bank of my Camry... grrr

OMG, those are toast.