I find it pretty strange that on all these forums about the 4runner and talk about the best spark plugs....that nobody can seem to agree on what the best gap setting is.

You would think by now that there would be a standard spark plug gap for the 3.4L with SC or w/o SC. Nobody can seem to agree though on what plug is best, or what gap is best. I hear anywhere between .032 to .044

I guess I'll split the difference and go with a gap of 0.38.... right in the middle.

The gap is always slowly getting bigger anyway just from normal heat and wear.

I do know one thing for sure.... A bigger gap will create a bigger spark to ignite the fuel/air mixture better and more efficiently, but everything has a point of diminishing returns.

The one thing I'm looking for is the gap that produces the best fuel economy and the most power for our SC 3.4

 

As long as you can gap the plug supercharged guys will see the best performance at 0.032". Midiwall did some testing with him and another guy and found this to be the case.

 

I don't think your supposed to gap the triple prong plugs I'm running.

 

So I went ahead and installed the NGK BCPR7ET #5509 3 prong plugs in my 2000 4runner yesterday. I also put in new NGK TE66 wires.

The rig runs great, but now I'm having some clicking on the FM radio. WTF?

The old plugs I pulled out were NGK BKR5E 11 They were the single prong type and causing the engine (no mods) to knock a little. They also were badly worn and the gap was huge at about 0.060. I couldn't believe it ran as well as it did with such a big gap on the plugs. I gapped the new plugs to 0.038 and it seems to run a lot better....no knock at all...but now I have this clicking on the radio to deal with.

Anyone have any ideas on what may be causing it, or what to do to stop it? Thanks

 

Probably need to check the body/frame/dash grounds...

 

I found some spark plugs here at work that are for an es330 with dual grounds and platinum, they look like they will fit... we will see, if not Im sick of trying to find what part number I want from NGK, so I will prob just order the Denso ones.

 

NGK BKR7EIX-11 iridiums are working fine for me with the original gap. They are a step or 2 colder than the stock NGKs.

 

Hmm, I'm just trying to figure out how you reverse polarity on a spark plug that has two connections, and one of them is permanently screwed into a big block of metal thats grounded.

To reverse the flow of current from ground, you'd have to bring the center electrode to a potential less than ground. Is this how it is done?

 

K20PBR Denso #5060 .035 Gap