I have 93 eg si
I bought it as a shell it had no engine harness and no interior dash harness
So I went to the junk yard and picked up and interior dash harness off and ej1 ex 5 speed .
Then I bought a b20v engine with a ls trans, engine had an obd1 harness. I'm having issues with the car not reving up past 4K
Just recently got the distributor rebuilt
I'm using a chipped p28 ecu
I don't know what engine harness I have on the swap

So my question now is should I get the ej1 engine harness or should I mess with the engine I have on it now ?

 

You should pull any CEL codes and post them.

 

Only Cel code i get is a code 4

 

Which is the CKP sensor, which will put the ECU into limp mode, which will stop it from going past 4000 RPM. If you don't have a voltmeter, go buy one, then follow this flowchart.

 

Socket and chip the ECU to bypass the Crank Sensor.

 

...Or fix the issue properly.