[Mango357]

Ran a compression test. All cylinders except number 7 read normally at ~150psi. Cylinder 7 was reading 90-150 on the first compression test after the engine sat, and then would read basically 0 for the subsequent tests. Seemed odd.

I ran air from my compressor into cylinder 7 at about 60psi and traced the leak to coming out of the oil cap.

Since there clearly was an issue inside the cylinder, I took off the coils and the valve cover to get a better look. The valve springs for cylinder 7 both looked pretty good. Cranking the engine showed everything moving correctly, except the second to last rocker which was completely motionless. I pulled the rocker off and pulled the pushrod out. The rocker and pushrod both seem to be in good condition.

I reinserted the pushrod and held my finger on the top of it while someone cranked the engine. The rod didn't move at all. I'm guessing a bad lifter?

Next step seems to be to remove the head and get to the lifter. Was hoping to avoid this, but oh well.