I lost the compression in #4 cylinder this weekend. It happened suddenly. Pressure on front 3 cylinders is >170psi, but #4 shows no movement on the gauge. I poured oil in the #4 cylinder and did not get any change in the pressure reading. I pulled the valve cover so I could see what was happening to the valves. When I added compressed air through the #4 sparkplug hole (all the other spark plugs were out too) I got air out of whichever cylinder had the intake valves open. It sounds like I must have a stuck intake valve on #4 cylinder. Is that possible? Is it likely? I will probably get the head pulled off tomorrow, but thought I would ask tonight in case there is something else I should be looking for.
One other thing. I developed a very noisy exhaust leak, either at the same time or around that time. Quick look at exhaust system doesn't show any leaks. Seems like it might be a head gasket? No water in oil that I can see. Oil is down about 1 quart after 5 sessions, which is not normal.
Carl