I had a problem like that. I tried everything I could think of and finally took it to ken @ 007 and had him look at it. Turns out the problem with my ICS was the o-ring on the piston wasn't sealing very well. When I had looked at the o-ring before it looked fine to me. What I didn't check was that the piston was actually compressing air when it was pushed in. If you hold your finger over the end of the brass nozzle on the cylinder head and push the piston in it should be hard to push in (on account of the air inside being compressed) If the piston slides in easy then the o-ring isn't sealing
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