Ok, so I purchased a pressure transducer from Autonerdz.com(great customer service BTW) to complement my Pico Scope. Would you believe I had chance to try out in-cylinder pressure testing within 24 hours of its arrival?

wps500x

I was thrown a soft ball if you will. 2005 Jeep with a 4.7 misfire, quickly amp ramped the coil = good and tested injector voltage= good with pintle bump / hump.

Eager to try the pressure tester I installed to a known good cylinder and…

Moving to the bad cylinder

Clearly no exhaust valve opening… and the sticking valve caused the rocker to fall off. Common problem , very cool to know before any disassembly!