My coworker just parted out a '01 RS.
So, since the EJ25D is leaking like mad anyway, let's yank it out, and put in the 251.
Pulled the EJ25D last night, and noticed an oversight. Continued research today has me worried.
All EJ25Ds have the idle air solenoid mounted to the manifold next to the throttle body. And all EJ251s have it integrated into the throttle body.
Then came the thought, we'll just swap throttle bodies. Well, then we'll have nowhere to put the solenoid.
So, started researching swapping electrical connectors, and having the 25D ECU control the 251 stuff.....looks like the TPS would be fine, but the idle air, not so much. Looking at the pinouts, looks like the 25D has an Open and closed signal circuit coming from the ECU. Where the 251 just has one signal wire.
What are the odds, that I could hook up the Open signal wire from the 25D ECU to the lone signal wire on the 251 IAC, and have it work?
Plan B....Possible that a phase 1 EJ22 intake manifold would work? Gaskets are a different part number, but they look awefully similar.
Edited by Numbchux, 26 January 2013 - 04:50 PM.