GRJ76K Spark Plugs

[Mike M]

Why do Toyota fit odd plugs to the V6 engine?

Denso on the right and NJK on the left which i find very strange.

I'd read some posts in America that its normal with forerunners etc but something i've never come across before.

 

[CruiserScot]

I've never checked mine. The part number is the same for all 6 so it seems odd that there are two different makes

 

[Mike M]

Yeah very strange. The car had 4k on the clock when I bought it so wouldn't have expected anyone to have touched them.

 

[CruiserScot]

Maybe they buy from both suppliers and use them interchangeably or, as I saw posted elsewhere, someone changed them but only did the easy to reach ones!

 

[Mike M]

Yeah, well ill be servicing the cruiser next month and probably going to replace them all with NGK platinums. I was only curious to see how the gaps were doing after 22k and not good lol. Plus I wanted to check plug tightness as I have a ticking noise that appears under load sometimes when working the engine hard, I suspect the exhaust manifold gaskets are leaking when the exhaust temps are higher.

Would love to find some headers for it

 

[scottmk1]

Might be of interest if you didn't know already but the Factory Service Manual gives this info for recommended plugs:
Manufacturer Product
DENSO - K20HR-U11,
NGK - LFR6C-11

Gap for new plugs = 1.0 - 1.1mm

Tightening torque = 20NM

 

[Mike M]

Cheers,

Platinum NGK upgrade plugs are PLFR6A-11

My gaps were around 0.045" thou and larger.

My feeler gauges are imperial lol ( 0.039 - 0.043) plug gap tolerance.