Ichthys

my 2010 RX manual calls for spark plug replacement with Denso FK20HR11 gapped to 0.043"
Is there a "better" newer plug to use (developed in the past 4-5 years)? Is that Iridium or ?

Any plug removal tips by guys that have done it?

thanks to all you experienced techs

Clutchless

The front bank is easy, the rear bank a real PITA according to the folks at ToyotaNation Highlander forum as they have more members that work on their own vehicles. The Highlander is a mechanical twin to the RX350.
I do not know if there are any newer better spark plugs available, but doubt it.

Look at this and you may want to have a shop do it http://www.toyotanation.com/forum/12...placement.html

steveo55

the back ones look impossible there looks to be a bunch of stuff in the way that would need to come off.

01LEXPL

iTrader: (10)

The process is as described in the TN thread, it was the same process for the 2nd gens as well.

justin1203

I realize our RXs can go up to 120k before replacing plugs,

but has anyone ever replaced the front three only (at say 60k) in hopes it would help with fuel economy / performance?

I suppose it is possible that the front three are completely fine and it happens to be that one in the back is fouled; but considering it is a simple job taking a 1/2 hour, was just wondering what others thought.

Or could this do more harm than good?

raylor4

"Half measures availed us nothing"
Changing half the plugs is like emptying half the sink, shoveling the snow half way out the drive, changing half your oil; you get the idea.
I suggest you remove one plug from the front bank, examine it, check the condition and gap, and if it looks OK, figure the back three are the same and make the decision. I would have an experienced person change the plugs around 90K, and ask for the old plugs to be used for sinkers when you go fishing. Just kidding about the sinkers part. Be sure to use platinum or iridium plugs. They are vastly different from standard plugs. About $16 each, as I recall.
Ray A.

justin1203

Thanks Ray.

Thought that may be the case :-/

I'm only at 74k but will have a look when the time comes.