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I'm told that the left and right cylinder bank of a 3.4 V6 uses different plugs. I'm curious as to why this is? This makes absolutely no sense to me and sounds like a poor design.
 

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it may be dumb but it doesnt matter. the factory uses different plugs but they are the same size. if you are replacing just buy some ngk's or whatever they are for all 6.
 

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Don't buy different plugs, thats just a pain in the ass. Get some NGK iridiums or denso's and screw em in. You won't see a difference.
 

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97TacoDude said:
I'm told that the left and right cylinder bank of a 3.4 V6 uses different plugs. I'm curious as to why this is? This makes absolutely no sense to me and sounds like a poor design.
On the old board someone once posted an answer they'd received from Toyota on the reason for this. Dont remember the full post, the main reason behind the difference was credited to the ECM computer and emissions readings from the factory.

Tim
 

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I got OEM plugs from the dealer and they were all dual prong Densos. The plugs I took out were all dual prong NGK's and could have been the originals.
 
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I had 7th installed a few days ago and replaced original plugs with Denso Iridium. ALL the original plugs that came out of '02 Tacoma were the same, Denso K16TR11. That was for 3.4 engine.
 

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97TacoDude said:
I'm told that the left and right cylinder bank of a 3.4 V6 uses different plugs. I'm curious as to why this is? This makes absolutely no sense to me and sounds like a poor design.

My Toyota factory manuals say to replace the plugs with either Denso K16TR11 or NGK BKR5EKB-11 on the 3.4 and says nothing about using one type on a specific side.
 

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Hey....first post.

I was told that at the factory, there could be different plugs on either side of the assembly line. If you have different plugs on either side, it happens to be what that assembler had on hand to install but they were all the same basic plug anyway. As long as you replace the old plugs with dual prongs, everything should be fine.
 
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