I have this tapping/knocking happening This only happens during the warmup stages. Once warmed up, it does not happen. Also, if there is any load on engine during warmup, it does not happen. Could this be lifters, rockers, valves? I would be interested in replace the lifters, but I just don't know if that is what it is. I recently purchased this car just shy of 200k miles. it is a 2017 - YouTube <<< yt shorts link
Nope, still is a thing. Has not got any better or worse. I put over 20k miles on so far. @218k I used some MMO without change. I am on my 4th Valvoline Restore and Protect oci no change. Oh well, I'm sure it is lifters, rockers or valves, but have not opened her up yet.
Under the hood in the video looks like a 2ZR. That's quite a loud tap, sounds like about once per cam rev, so maybe it wouldn't hurt to have a look under there. Maybe one of the hydraulic adjusters has failed to adjust. Replacing all 16 lifters might be overkill $$ if one is misbehaving. Unlike the select-fit lifters in the 1NZ engine (with 35 sizes each to choose from for intake and exhaust), the hydraulic adjusters in the 2ZR are identical and if one is bad and you can't get it working, you can just replace it.
2017 Prime, just updated sidebar, and my siggy shows * current I will have to open her up and check out the lifters. Have to watch some more vids to refresh my memory, there was a great one showing lifters in general thanks fellas
Not sure if you'd still call 'em 'lifters' in the 2ZR design—Toyota figured out a place to put 'em where they never have to lift. They're under the stationary ends of the rocker arms, which the camshafts push down in the middle. Anyway, "lash adjusters" still works.
