my vtec dont seem to engage. using stock 1991 crx dx harness with (ebay) obd0-obd1 jumper p28 chipped ecu. tried tuning with crome and computer was saying vtec was engaging but it wasnt and no power.

a friend of mine told me to check speed sensor checked it and it was wired up my MPH works. Do i need to jump it somewhere else?

Did so far

checked oil
cleaned vtec solenoid
checked wiring (only wired up vtec solenoid and ground, and vtec pressure and the rest was disabled with crome (o2 sensor knock sensor etc....)

any help would be apreciated thanks