Just double checking, I guess its different for both motors.

I was referring to this DIY:

https://www.clublexus.com/forums/is-...necessity.html

Thanks for the write up though I've been putting it off because I thought it was pretty labor intensive. Another reason I'm glad I own the 350

 

definetly gunna do this in 8k, thankyou javy

 

Good Job on documenting!

 

What about the port fuel injectors? Do they not need to be replaced as well?

 

^Not for 60K spark plug service...

Javier

 

sick write up as always Javy! thanks again as always!!!

 

Anyone have the NGK spark plug part number for the cheaper copper replacements ?

 

I read in another thread about a specific brand of plug that actually increases perf on is250 BS or truth??

 

you are the man javier!

 

Javy, thank you so much for this writeup...not sure i would have attempted it otherwise. I figured it would have been a much bigger PITA.

I just wanted to note a few things which may make this a bit easier for some. (Take #3 with a grain of salt....some may disapprove)

1. for the driver's side plugs, I found no need to disconnect the front part of the wiring harness. There are 3 plastic clips that hold the harness; if you pinch the back with a pair of needle nose pilers, they will pop right out. This is all i had to do to access all 3 plugs.

2. For the front most driver's side plug, a small 3/8" drive 10mm socket just fit. not everyone has the ratcheting wrenches, and even if you do, there isn't much room for swing. the 3/8" drive with a small extension works fine.

3. Torque specs from the factory were much different than what was posted. When breaking all 6 plugs free, my torque wrench didn't go past 160 inch pounds, which is 13 foot pounds. When tightening, I didn't feel comfortable with 18 foot pounds. This could have been that the engine was warm, so i went to about 175 inch pounds. There is a good chance that when the engine block cools, it's about 18 foot pounds. I've changed a million spark plugs, but never with a torque wrench. figured i'd use it on my first fancy car....but still trust my experience more than numbers.

Overall, this is a very simple job. Took me an hour and a half. Could probably do it in 45 minutes now.

Good luck to all that do this! simple way to save about $300

 

^Good feedback. As far as the torque specs are concerned, the specs I posted are directly out of the Lexus Factory Service Manual. As we all know, the constant heating/cooling of the engine block can certainly change the torque of the plugs (which is why getting the correct torque correct applied the first time is so important).

Javier

 

thanks for the detailed writeup...is motor oil better than anti seize ???

 

I used the motor oil on the first few threads to prevent cross threading, not for future seize issues.

I personally don't find the need for anti seize on spark plugs, but I guess that'd be personal preference.

 

Just an FYI, you should not use your torque wrench to break a connection... it can mess up the calibration.

 

True, but I have a torque wrench from 1960...hahah, no calibration needed/possible