1. If one takes head out, would it be possible to verify cylinder bore crack.
2. Could you pour oil to verify piston ring gap against the cylinder wall when head is out
3. Assuming cyl 1 has no compression due to piston ring gap, but if injectors works could spark plug be wet
4. Could cyl 1 fuel injector be clogged beyond reparable (I checked resistance and it is good)
5. Could Car's PC malfunction causing cyl 1 having no fire at all.
6. Could CPS (cam or crank) malfunction contribute 1 cyl being dead.[/b]
First, 4,5 and 6 are irrelevant since they have no bearing on compression. The engine turns, so the piston cycles and so it either has compression or doesn't.
Second, if the injector is fine then yes the plug could be wet and if you had a code reader that could read in real time and download to a computer you would see issues with the O2
sensors reading unburned fuel downstream.
Third, yes you can squirt a little oil into the cylinder and if the rings are the issue you should get a bump in the compression. This is the part where I wonder what the first mechanic was even thinking. He had the cylinder head off and could see everything unless blind. Where does he come up with the idea that a ring is stuck. Did you not run this car for years. Did you run this car with incredibly old and dirty oil. The other causes are improper installation. I doubt it, right? So if the compression doesn't change then the valves come next.
Last, a cylinder bore crack? Well, I know the Vulcan is not a high performance, high compression engine operating at it's limits so that eliminates blowing the engine from those reasons easily. I can't even see overheating as the cause as weaker components would give way first like the cylinder head gasket or the cylinder head. That is another thing to consider because if you take the head off to look at the valves you can also see if there is a small crack in the head and it would likely be near the exhaust valve.