idosubaru Posted April 28, 2008 Share Posted April 28, 2008 Why does a 1995 EJ22 engine swap into an EJ25 vehicle and is plug and play, but the 1995 ECU will not plug and play into an EJ25 vehicle? Link to comment Share on other sites More sharing options...
Manarius Posted April 28, 2008 Share Posted April 28, 2008 Why does a 1995 EJ22 engine swap into an EJ25 vehicle and is plug and play, but the 1995 ECU will not plug and play into an EJ25 vehicle?No EJ25 came with OBDI settings - so an OBDI ECU would have issues with running a OBDII car. Link to comment Share on other sites More sharing options...
idosubaru Posted April 28, 2008 Author Share Posted April 28, 2008 No EJ25 came with OBDI settings - so an OBDI ECU would have issues with running a OBDII car. where do the differences lie i wonder? because an OBDI ECU doesn't have trouble running an OBDII engine...say if you swapped an EJ25 into a 1995 vehicle. you can swap OBDII engines, intake, including the engine wiring harness just fine. you would think the wiring would be close since the intakes are plug and play. Link to comment Share on other sites More sharing options...
john in KY Posted April 28, 2008 Share Posted April 28, 2008 My 95 wagon is OBDII. Link to comment Share on other sites More sharing options...
nipper Posted April 28, 2008 Share Posted April 28, 2008 1995 was a transition year. Some will be obdI (not many) others will be OBDII nipper Link to comment Share on other sites More sharing options...
hankosolder2 Posted April 28, 2008 Share Posted April 28, 2008 Gary, Yes, the engine harness, injectors, sensors mounted on the engine are interchangable, but I think plenty of other parts are different- particularly, the MAF and probably many other chassis mounted parts. You could compare the pinout of the ECUs- that might be completely different. (I.e. the engine portion of the wiring harness is interchangable, but the body/chassis portion may not be.) The OBD 2 vs OBD 1 issue is a bit of a red herring IMO; '95 Legacys are OBD 2 compliant more or less (OBD 2 scanners work on them.) I don't know about the '95 Impreza. Nathan Link to comment Share on other sites More sharing options...
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