This thread has been out here for a long time but I used the instructions yesterday for an 2003 RX300. Your instructions and pictures were a great help. I will add some notes from my experience;
I used a #3 Phillips pozi screwdriver bit on the 3 screws holding the throttle body. They were definitely torqued but the pozi bit fit very tight and worked great. I did need 'help' with one of the screws holding the IACV to the throttle body. They were also very tight. 3 worked fine but the 4th one seemed ready to strip so I used the 52168 extractor set from Sears. The 52168 set worked great. The picture shows using them with a drill but I used a hand driver which did very little damage and so was able to reuse the screw.
My wavy washer on the electrical coil shaft didn't pop out of the recess at the back of the magnetic shaft when I removed the coil so I wasn't sure where it was. I put a small plastic tray under it just in case it fell as I continued. As I loosened the throttle body it came out of the recess so I took it off and put it to the side. You definitely don't want to lose it.
You don't have to cut the tie-wraps on the side and top of the throttle body. I used a small flat bladed screwdriver to reach behind the two holders to press in the tabs that hold them in the bracket. Press one in and tilt the plastic piece enough so it doesn't pop back out then press the other side in and it came right out. When putting it back just pressed it in.
Regarding the tube that comes from below and connects to the metal tube that goes straight up into the IACV (not the one that is L shaped) you mentioned 'some leakage' of anti-freeze....I wasn't paying enough attention to that and dumped most of the coolant reservoir on my garage floor before I heard it going on the floor and got something under it. Then I figured out if I had just lifted the hose up higher (than the reservoir) it might not have leaked but I stopped it up with a yellow wire nut I had on the work bench. It plugged it up nicely. No more leaking.
I used CRC carb cleaner and it didn't seem to clean as well as yours...also it seems you need several different sizes of small brushes to clean it out well. Maybe tiny bottle brushes or something. It being Sunday and I was headed out of town I did the best I could with what I had but did not get it as clean as yours. As another person posted his IACV also had the problem where it was sticking when it was turned in one direction Mine was doing that also but in addition it had a couple of sticky spots as I turned it. Felt like it had rough bearings. As soon as I got that shaft completely clean (both sides) it turned smoothly. After I reassembled last night I drove the car for an hour or so (before leaving town) with no rough idles and it seemed to start quicker than it had been but not too sure about that one.
Just one more note on the various screws. Sent my wife to the dealer to get the 3 Throttle body screws and 4 of the IACV to Throttle body screws before starting. They gave her 3 of the top throttle body screw (which is much shorter than the other 2 screws) and told her the IACV to throttle body could not be replaced because they are 'glued' in. If you've read down to this point you know they can. ACE Hardware has screws the same diameter and thread count (sorry I don't remember the exact size ...M5-8 I think) but at my local ACE the screws were either slightly shorter or slightly longer than the one I used the screw extractor on. I took the longer ones and some washers but since I didn't damage the original very much with the screw extractor I reused it and it tightened up just fine.
Again thanks for the very helpful instructions....and hope my experience helps someone else.
