a friend of mine has a b20z2 block with a b16 head.. in a 92-95 4 door lx
12.1cp pistons
ctr cams
p28ecu
jdm b16 oil pump

ever since we put this motor together vtec has not worked.. we have tried 2 different b16 heads... 2 different vtec sileniod's with pressure sensors.. played with the timing.. and etc.. oil level is good.. changed the oil pump to a newer b16 oil pump.. 30psi at idle and bout 80 right before vtec hits.. then it just climbs.. the ecu is a p28 with the vtec sileniod run to pin number a4. and vtec pressure sensor to d6.. so now what im wondering is why is there still a vtec pressure code?? also has a iacv code and o2 sensor code, it used to have a vtec sileniod code but that went away.. the sileniod clicks and all.. but if you run the car and take it to about the right pressure and put vtec on by a switch it doesnt even show a difference.. so can anyone help us.. we've practically tried everything.. even tried another ecu.. doesnt make a difference. thanks alot guys! need help asap