Engine swap 1.6L 4A-FE to 1.8L 7A-FE, Anyone done it? Options

[Bikeman982]

I have swapped engines and transmissions and am running into some questions for someone that has done it. Please let me know if you have.

[Bikeman982]

The engine/tranny and wiring harness - ECM/ECU came off a 1995 and the car is a 1994. The reason I changed the harness was due to the transmission having a different park/neutral connector on it and the harness for the 4A-FE was different. There may have been other connectors that were different as well. Since the majority of changed parts were 7A-FE from a 1995 I was trying to keep it all 1995 compatible.
The ECM/ECU has three connectors on it and on the 4A-FE there is a 12 Pin connector whereas on the 7A-FE there is a 22 Pin connector.
As Bitter has said - I may have a harness that is for an OBD2 car and not from a OBD1, but the harness is the same and it is the cars connection to the ECM/ECU that appears to be different.
I don't know if the donor car is still at the junkyard, but I can check the connector on that car. It was a 1995. I took both the ECM/ECU and the wiring harness from the same car - but the cars internal wires must be different. I will have to check it out.

This post has been edited by Bikeman982: Aug 3, 2006 - 7:03 PM

[Kwanza26]

The engine/tranny and wiring harness - ECM/ECU came off a 1995 and the car is a 1994. The reason I changed the harness was due to the transmission having a different park/neutral connector on it and the harness for the 4A-FE was different. There may have been other connectors that were different as well. Since the majority of changed parts were 7A-FE from a 1995 I was trying to keep it all 1995 compatible.
The ECM/ECU has three connectors on it and on the 4A-FE there is a 12 Pin connector whereas on the 7A-FE there is a 22 Pin connector.
As Bitter has said - I may have a harness that is for an OBD2 car and not from a OBD1, but the harness is the same and it is the cars connection to the ECM/ECU that appears to be different.
I don't know if the donor car is still at the junkyard, but I can check the connector on that car. It was a 1995. I took both the ECM/ECU and the wiring harness from the same car - but the cars internal wires must be different. I will have to check it out.

You're doing it the hard way. You don't need to swap harnesses or ECUs or anything like that... the 7AFE can run alright on the 4AFE ecu and wiring. All you need to do is to swap over the sensors from the 4AFE to the 7AFE... and ignore the sensors on the 7AFE that the 4AFE doesn't have. That way you can just plug in your old 4AFE harness and not have to worry about anything else. There shouldn't be too big of differences between the two... at the most you might need to splice injector plugs and swap distributors. It should be a very straight foreward swap... cause I'm pretty sure the 4AFE uses about 90% the same sensors as the 7AFE... except for a few different plugs here and there.