i know this is kinda ghetto, but you said you jumped the solenoid. and it worked. so take the hot wire and run it to the horn and test it then. if it worked when you jumped it will work when you hit the horn. then you will be able to determine if vtec even engaged properly. just a suggestion. also if you got a manual oil pressure gauge run it to the head to see if the head is getting enought pressure to eliminate the oil pump and oil pickup.