You really should have this diagnosed by a professional. Valves don't just stop opening. It would have been cheaper if you did that before changing the lifters. There are dozens of things that could be causing your problem and it will require a series of tests to isolate the reason.

Answered by Wrenchtech (expert)
14,743 answers provided

YES SIR WRENCH TECH I AGREE. HOWEVER I RUN A REPAIR SHOP. I HAVE SOME I PHONE VIDEO'S OF THE PROBLEM. I HAVE NEVER SEEN THIS BEFORE. THAT IS WHY I AM ASKING FOR HELP. I INSPECTED CAM: OIL PRESSURE GOOD. PUSH RODS GOOD. ROCKER ARMS AND SHAFT MOUNT GOOD. THAT'S WHY I'M ASKING. IS THERE A TEST YOU COULD INFORM ME OF?

Response from JEFFJ
21 questions asked

Start with compression and vacuum tests and see what they show.

Answered by Wrenchtech (expert)
14,743 answers provided

MY FIRST EXPERIENCE WITH AFM! BAD SOLENOID COIL UNDER TOP COVER!!!!! PIP4568K

Response from JEFFJ
21 questions asked

There is an old saying that goes like this: A little knowledge is a dangerous thing. Be sure that you KNOW what the problem is before you attempt to repair it. This is not offered to aggravate the sender, it is offered to put perspective on the possibility that you could learn something from your misstep on this occasion.

Answered by Dr. Hagerty (expert)
9,669 answers provided