i have a 91 Si with a B16A3 its converted to OBD1 with a stock P28 ECU and it hesitates untill high rpms and does not kick VTEC even though its wired....what could it BE?????

 

any check engine lights on? check ignition timing? check throttle position sensor voltage? how high are the RPMS?

click here for VTEC troubleshooting:

https://honda-tech.com/forums/hybrid-engine-swaps-18/%5Bfaq%5D-%22my-vtec-doesnt-work%22-1812135/

 

When you say hesitation, does your tach bounce under acceleration? If so, its usually that your ignitor wire has a poor connection. Pull off your distributor cap and rotor. Then pull off each wire and crimp down the opening on the wire ends. You may also want to add a little dielectric grease to make the connection better. I have had this problem with a number of b16a's and my old b17a1.

 

check spark plugs and dumb question but have you checked your oil level?

 

yes spark plugs and oil are good and no bouncing in the tach i just found out its running on a stock P28 with OBD0 to OBD1 jumper harness and a OBD1 LS dizzy...if i put a OBD1 DOHC VTEC Dizzy will it run better? and by hesitation i mean it sputters till about 5000RPM n then its accelerates fine but NO VTEC and VTEC IS WIRED!!

 

O and NO check engine lights timing is on and im not sure about TPS sensor voltage