2015 diagnostic mystery

[Potius]

Cylinder 2 and 4 lifters

[Potius]

Cylinder 6&8

[Potius]

And finally a close up of the lifter from cylinder 8 

[rav3]

How many miles does that lifter have on it?

 

[Potius]

188k

[rav3]

Wow! It's had a good life.

[richard wysong]

How does the cam look?

[Potius]

Not sure yet buying an inspection camera in a few days to look down the hole. Its cylinder 8 so too far in back to see by eye. Hoping cams fine. If so ill replace lifter and tray as well as clean up or replace the valves 

[UrbanRage]

Wow, that lifter has seen better days. I'd like to know how the cam looks. Considering you have gone this far into the engine, have you considered doing the DoD delete? If you decide to go that route, I can provide you with some feedback on the kit I used. 

Edited November 19, 2024 by UrbanRage

[Potius]

I thought of about the dod kit but I’m still hoping cams fine is good so I don’t have to mess with the other side lol

[richard wysong]

from the looks of the lifter I bet the cams junk

[Potius]

If I had to guess I’m thinking cam lobe got worn down caused the pitting on lifter and wasn’t “lifting” it enough for the exhaust valve to work properly hence all the blackness on valve and exhaust port for cylinder 8 which was giving me the misfire. But again that’s only a guess until I get the camera in there

[asilverblazer]

Bummer. 

[newdude]

Does the roller roll still?  Lots of them when they do that, the roller bearings in the roller have either gone or are going or some are missing.  The roller then starts to stick and grind into the camshaft.