vtec not working?

[fusionprelude]

could be vtec solenoid, vtec pressure sensor etc or even dizzy giving way my old 4th gen did this i had to replace engine loom dizzy vtec soleniod and ecu
is urs manual or auto

[ilovecarmen]

mine is manual. i can hear the engine goes louder at 5500 rpm but the rev's just goes up like normal. normally wen i hit vtec it revs up fkn quick but now its like i have no vtec but i can hear it after 5500rpm's. wat is a vtec soloenoid? how do i change it?