Toyota's have noisy injectors across the board, but they're fine. I noticed the ticking on my 05' V8 w/ 52k, as I did on my old 95 LS around the 105k mark. Seafoam has cured both cars. I'm told the injectors tick, but I've also been told the valves can get sticky too and tick. I put seafoam in the LS at oil change time for three changes in a row. I put in about a 1/2 can, let it idle for 30 minutes, then wait for 2 hours for the oil to drip into the pan, then change it. I prefer an extra quart of clean oil to flush out the remains stuck in the corners of the pan. But some do not..I'm just a bit freakish I guess. After the third attempt on the LS, the ticking deminished to barely noticable. I did the seafoam two weeks ago on the 4Runner, and switched over to Mobile 5w30... The ticking is gone. It has never reappeared in the LS, and I have 30k on it since. The 4runner is certainly louder than the LS, but not so much that I can't hear it operate. My friends wife has the V6, and it is certainly noticable. Going to seafoam her engine soon and will post up the results.
For some reason, Toyota's love seafoam. Through the intake, in the oil, and in the gas...great stuff, has revived the LS like you wouldn't believe. Nissans and BMWs don't seem to respond to it as well, but the Toyotas, or at least the ones I have, love the stuff.