LS vtec wont rev over 3500

[rhdedmgeno12]

I just turned my 1997 LS into a LS vtec. the car is OBD2 and ran prefect before putting on the B16 head. Now when I start the car it wont rev over 3500rpm. I put in a OBD2 p72 ecu. I dont understand why it wont rev, when it was just LS everything worked perfect. I changed the MAP sensor thinking it would fix the problem and have good fuel pressure. If you had ran into this problem before and could help. thanks

[godspeedcrv]

what are you running for fuel management? Are you using a chipped ECU? What type? Did you use the right fuel pump? VTEC Spark plugs and wires?

[LS/Vtec]

You prolly have ur TPS and MAP Sensors Plugged in backwards. Try switching the 2! Lemme know.

[DrAsTiC888]

could even b an injector issue

[LS/Vtec]

could even b an injector issue

x2. But def check the map sensor and tps. And make sure they are into the right ones. because thats what it sounds like.

[rhdedmgeno12]

I checked the MAP sensor and the TPS and they're in the right spot. The wires for the tps arent long enough to go on the MAP sensor.