Underneath the black plastic with the writing on each valve cover.
I use the Denso plugs in my SC400
the spark plugs are located under the cover, you must unscrew the Lexus symbol and the 3 other screws at the bottom and the 3 of the spark plugs are in front top, the other 3, back top
how do you change spark plugs on 1995 Lexus es300
How do you change the spark plugs in 2001 lexus rx300?
You have to remove the panel on the valve covers, 4 bolts, and under them are the plugs.
how would you go about changing the spark plugs in a 1999 Lexus ES 300?
2006 Lexus gs300 awd check engine on after spark plugs replaced
the answer is elsewhere on this site. it appears that 3 of the plugs are on the back of the engine and you have to jack up the car to get to them....
Change spark plugs on 1999 Lexus GS300?
The 2001 Lexus IS300 uses a 2JZ-GE inline-6 Toyota engine, and has 6 spark plugs.
After you take the cover off the engine there are three square electrical looking things and when you unscrew all those and take them out the spark plugs lie beneth there.
Check the sparkplug wires, vaccum lines, and spark plugs, mine did the same thing, and i did a $1000 complete (home) tune up then it purrs like new.