I like the '01 ECU.. the Ignition Timming is a little More Agressive, and the Fuel Millage is just a little bit better.. And swapping ECU's with the Immobilizer can be a Pain if you do not have the ECU's key..
I have the complete '04 driveline for the '00 car. What needs to be retained and what needs to be kept from the '00?
I was going to have the engine and transmission installed as they are very low miles. While I haven't seen the new engine/transmission yet, I assume I need to retain the '00 exhaust manifold but what about the fuel rails and intake manifold?
Also, since I will be retaining the '00 ECU I assume I need to swap the harness as well?
I'm curious about this as well, as I'm basically doing the same. Would there be any advantages or disadvantages keeping a '00 ECU instead of an '05? And anyone know offhand if the "JDM," ECU (IDK if there's a difference there either) would present a problem?
Are you certain it's a like-for-like swap (MT to MT, or SMT to SMT)?
Although, oddly enough there is a different part number for the USDM 5MT engine wire harness beginning 2/2004.....
A buck says it's an emissions systems change. If you can use the old harness, go for it.
Based on what I know now, it appears that the engine, less the intake and exhaust manifolds and transmission is identical. But there may be differences in the manifolds, intake track and fuel rail/system. That would mean a different harness and ancilaries. I don't know and without the car in front of me to inspect, I can't be sure.