Actually, I had a little problem with the timing belt installation. I ordered a timing belt kit off ebay which consisted of OEM drive belt, timing belt, water pump and aftermarket idler bearings. Although the timing belt was oem and had the toyota sticker on it and everything, the only marking on the belt was the L cam, crank and a random dotted mark. I went to the Lexus dealer and they were nice enough to open a new belt and allow me to match up the crank markings and mark the L and R cam. My L cam marking was one tooth behind the original L cam marking on the belt.
Putting on the timing belt, instead of the white marks on the pullies, there were yellow dots on the pulley and the engine. I lined up the crank line, the R cam marking that I made matched up with the yellow dot. For the L cam, matching up the yellow dot on the pulley and the engine resulted in using the original L cam mark on the belt, not the cam mark I made. So I just put it on, assuming as long as the dots lined up, it shouldn't matter.
I rotated the crankshaft 2 revolutions and everytime, the yellow dot markings would line up, but the timing belt markings were always somewhere else. I tried this multiple times, each time resetting the timing belt, installing the tensioner then rotating the crankshaft. After 3 trials, I assumed it was suppose to be like this so I just started assembling everything.
Could I have actually advanced the L cam timing by a tooth? This car I bought and there were 2 owners before me. Since there were no white marks, I'm thinking the pullies might have been replaced for some reason by one of the previous owners. But it doesn't make sense that the cel light would light up when the car is traveling slow though.