I'm trying to diagnose why my VTEC isnt working, and why the engine isnt throwing any codes, and I have a car lift and its a lot easier to try stuff when I dont have to take it out of the garage every time I want to rev.

Should Vtec engage if the car is in gear and just reving on a lift? or can it somehow sense if the car is moving or not?

 

if it's a sohc it prob is engaging and you just can't hear or feel it

 

I think that obd1 wants 15 mph (and a few other interlocks like temp, thursday...) - I don't know about the others.

 

yes you have to be moving and motor has to be warm.
of course oil pressure.