So I've been having some engine trouble with my 98 Mazda 626 GF 2L, specifically a low, rough idle and lack of power on acceleration. One of the things the WSM says to check for both these problems is compression.
So I did both dry and wet compression tests and came up with the following numbers. I turned the engine over once each time, then went around to the engine to record the reading ( real pita and took awhile ):
While I'm inclined to think compression is not the source of my problem there are some things going on here which I don't understand on cylinder #2. The first time I cranked it both times I got a really low reading, so I released the pressure and started over, I may have done too short a crank. Both times, after finishing the fourth cylinder I went back to the second one to take an additional set of readings. On the wet test I even did a third test. I'm wondering if maybe there is something going on with the spark plug threads in that cylinder, maybe there's a crack there or some other problem with the threads.