Re: Solenoid and Spike
Is this a pneumatic solenoid valve, or an electric solenoid?
Some solenoid valves have diodes and are directional. You might try reversing your wires and see if that fixes things. Or check to make sure your pneumatic plumbing is correct.
If it's an electric solenoid, make sure it's a 12V DC solenoid. Anything else is unlikely to work.