95 Neon firing problem

[PremiumSaltine]

1 out of the 4 cylinders won't fire. The coil, spark plug wire, spark plug, fuel injector, and the wire going to the fuel injector all work.

My dad mentioned it could be a stuck valve, but he doesn't really know much about cars and I have never messed with valves before. If I could manage to get to a valve and it is stuck, do I have to pry on it to unstick it or grease it up? Or does it need replaced?

Thank you

edit: I forgot to mention that there is no new noises and the FPR isn't showing the fuel line is holding pressure when the car is off, even though I'm pretty sure it used to.

[Airjer_]

Have you checked compression in that cylinder?

[PremiumSaltine]

I have no idea how to, but I guess I'll find out and try it.

[PremiumSaltine]

I got a compression tester today, but it was raining all day, so I'll be testing it tomorrow.

[PremiumSaltine]

Ok, I ran a compression test and every cylinder was at about 160psi except for the one that isn't firing. It was at about 200psi. What does that mean?

[denisond3]

This is a wild guess, because your symptoms are fairly unusual....
It could be an exhaust valve that isnt opening. You might need to take the valve cover off, and have someone crank the engine over while you watch to see that the valves for the '200psi' cylinder are working. If the rocker arm for that valve broke, or its roller broke, or the rocker arm shaft was coming unbolted - the exhaust valve not opening could result in higher than normal pressure.
Valves usually stick in the open or partly open position, and this seldom happens unless the engine is only run for really short trips, without any longer drives. Really short trips - like a block or so. That lets the oil get gummy. The valves get most of their lubrication from oil mist/spray, and with low oil temps on short drives - the lubing of the valve suffers.

If you find a 'stuck' or sticking valve, you can usually squirt oil onto its stem, work it up and down, and have it free up. And if one is stuck, you should oil all of them while you are in there, and change the motor oil, and take it for a nice long drive; 30 miles on open roads would do it.

I forget to say, I hope you let the engine turn about the same number of times when doing the compression check for each cylinder. The longer you let it crank, the higher the pressure might get - but 200 psi just sounds excessive. It might be okay for a fuel burning dragster with 14-1 compression though.