Non opening valve after start up 5.3 amf

[Bigbassman001]

I have a 2008 amf 5.3

recently I had a lifter stuck on cylinder 4.

i replaced that lifter and the valley pan that has the volm controls on it with success.

i then had a lifter slowly start to fail on 7.

i replaced it with all other amf lifters completing all amf lifters are now new.

at start up I heard a single click.

and dash signal reads engine misfire and constantly blinks with the traction control off signal.

i found the valve to be stuck closed. However easily unstuck with a light tap.

if I rotate the engine with spark wires removed and injectors unplugged, it works normally. I did take the head off again and replaced the intake and exhaust valve which looked ok.

i also removed and reseated all valves and replaced all valve seals.

same thing . It made the same single click at start up and still misfires on seven.

is it an oil delivery problem to the lifter?

and also it smokes a lot now

[Mikebtte]

I have seen new AFM Lifter bad out of the box. Possible a new lifter is bad. Also have heard a single click on start up and it was the A/C compressor turning on.