Originally Posted by
wright
Why would it matter if he use a 99-00 si harness? (not being a DH)
I would assume that if he changed from the 96-98 to a 99-00 SI harness it should work since the engine harness is a one piece harness. He might have the wrong adapter harness for the ECU that he is running.
OP can you give some more information on what you have done, not done, and what the car is doing or not doing.
Because they're different.
99-00 harness has 2 ecu plugs on the engine harness, and a green connector which connects to the underdash harness which has the 3rd ecu plug.
96-98 harness has 3 ecu plugs on the engine harness, and a green connector to connect to the underdash harness.