I bought a 94 gsr 4dr sedan with a 99 gsr motor and trans swap I was wondering if the 94 gsr ecu will run the 99 motor with out any issues

 

May have some issues with the harness really. Some modifications would need to be done here but the P75 or P72 ecu should be good. P75 may be easier to find

 

But would that keep my vtec from not working and where would u be located at

 

Car is running and drive able just can't get vtec to engage I just replaced oil pressure switch check solenoid that is good not sure what else to check other than if I have good power going to both

 

Given that the car is 94 and the engine is 99, maybe this has something to do with it? That goes back to harness woes and proper wiring. I couldn't say how the Vtec should be wired, but I would venture here and say this is our first clue..

 

Do u think the pc 75 ecu will work better and solve my problem if so does it matter which pc75 ecu I get

 

The '94 GSR ECU will run a '99 GSR engine JUST FINE !!! A P74/75 will not... these are LS computers and have no VTEC circuitry.

Now, since you purchased the car, has VTEC ever worked ??? More information would eliminate some items to test and help you identify the problem quicker.

 

If he was lied to when he bought the car, he might not know what VTEC is supposed to feel like in that car.
I suggest having a buddy hook up a multimeter to the pin for VTEC (most likely D6, but verify that with which ECU you have) and test it while you're driving. If there's no electrical output, then you know you're not getting signal either from a bad ECU or ECU that doesn't have the output for it. If there is electrical output, then you have a short somewhere.

 

Isn't A4 the wire for VTEC?

Is the check engine light on?