So vtec is not working on my obd1 b16 running an obd1 s300 p28 mapped for a stock obd1 p30 b16. The only CEL is Code 6 which is my engine coolant temperature (TW) sensor, but im throwing that code because i broke the connector and havent had time to run to junkyard to pick one up. Why else can VTEC not work?

 

by now you should have figured out that CELs are not your friend. I do not to this day understand why people are so impatient with things not to spend the time to diagnose an engine code. its a very simple process. Fix your code and report back to us.