3.4l Tick (again) Fuel Pressure Regulator?

I know the toyotas have a famous tick, but still trying to narrow it down. Mine has a whispy tick only under load. (Not idle) It's fairly loud and can easily be heard windows up in the cab. Sounds like its coming from the rear drivers side of the engine. I've read in other forums that it is most likely not the injectors, but it is actually be the FPR. Anyone else know anything about a ticking FPR?

 

Only when under load? Are you sure it's not pinging (pre-detonation) or spark knock?

If you're unsure, try running a higher octane fuel (91 or 93) next tank - if it goes away, then that's it

 

If the Fuel Pressure Regulator is bad, I do know on the 3.4's the gas will at some point makes it way toward the air filter. Again, this with a bad diaphragm in the FPR.
Not sure about it making a tick though.

 

Tried 91 and it still remained. Anyone else?

 

A ticking noise under load seems more likely to be an exhaust leak

 

I have yet to know of anyone who has had to replace one. I wish there was cuz I am beginning to suspect mine is acting up. Soooooo, if someone out there has had to replace one, please speak up. What made you change it?

 

There was some discussion here, not much, but @xtremewlr had a failure because the rubber dried out during an injector job.
https://www.tacomaworld.com/threads...e-while-i’m-there.522162/page-2#post-22569516

@Gibo says he had intermittent stalling on his 2.7L when his FPR went bad and replacing it fixed the problem.

I haven't heard of an FPR causing a tick, though.

 

Check your spark plug wires and boots for sparks migrating outside the boot. I had a Ferd F150 that had a intermittent spark tick.