My Rx300 has exact same problem, so I got read the forum and took out the 2 air intake hoses and the IACV locates right under them. I took out the two screws and cleaned the inside with the throttle body cleaner. The problem went away, so here is the pictures I took (IACV is the black piece with the two screws, one of them has the yellow dot on it).
Hope this help somebody in the future.
Be careful not to strip the two screws when removing them. It is challenging to break the factory torque to loosen those screws so find a very tight fitting screwdriver that will do the job. I am in the middle of cleaning my IACV myself..
I actually went and purchased hex head screws and replaced the phillips head screwa. Makes it easier to remove them the next time you have to do it.
Starting/idle Problem Rx300
in 99 - 03 Lexus RX300
Posted
I actually went and purchased hex head screws and replaced the phillips head screwa. Makes it easier to remove them the next time you have to do it.