I have a ticking noise too, and with a stethoscope I can pin point it to the #6 injector. However the rig runs perfect. Have run several bottles of techron throug it, no difference, so now just live with the noise....the "toyota tick". New plugs and wires did nothing for the noise. Compression is near perfect.
This spring I have to do timing belt and vc gaskets, so I might just go ahead and throw some rebuilt injectors in it while im at it. After all by then I should be at about 295k so they have seen some use. Last ones I did were from motorwest. Did them when I had a bad knock sensor. I bought their already done ones but now I have 6 spares right now and will send to them and have redone, they charge 20 per injector to test b4 adn after, clean , new seals and flow test print out. I think new seals are about half that per injector, so good deal I think. If you dont have spares or not time to send yours to them, then they do sell kits. They will also buy back your old ones when you are done swapping., well they used to anyway.
They also sell the fuel rail crush washers that you will need but not the fuel regulator o-ring.
no relationship to them, these were the guys mtbtim suggested in his video
Engine Misfire Diagnosis & Fuel Injector Replacement - YouTube
Injector Cleaning Service – MotorWest Performance