It's more pronounced when the engine is cold but, the ticking is constant (however it does quit for a few seconds here and there). This isn't the normal ticking you hear in a healthy 3.0, it's louder. The noise seems to be coming from an injector but not quite sure (I used a screwdriver as a stethascope). Sounds like a mechanical valve way out of adjustment (I know these engines have hydraulic valves, not mech ones).

1993 4Runner SR-5 4WD V-6 Auto Trans
1990 Pick-up (Hilux) 2WD SR-5 V-6 Auto Trans