Hi, I hope you can help out a newby with some questions on an older civic swap.
I have the mechanical part of a motor/tranny swap done between 1985 CRX DX and a 1985 Civic Wagon DX that had the CVCC vacuum system. The mechanical swap was fairly easy but the wiring harnesses do not match. I am looking for some help/suggestions on how to deal with that.
First, is it is possible to just swap the old wiring harnesses over and plug the donor crx harness into the wagon plug receiver in the dash or would I need to change out the plug receiver? If so, do you feed the dash plugs through the firewall or pull the harness out of the engine bay through the firewall?
If not, I assume I have some splicing or extra wiring to do. If I need to splice and rewire, can I just look for wires in the harness that are the same colour as the donor connectors and tape off unused wires? Can I leave sensors I do not need any more unplugged or do I need to pull the harness plugs at the dash?
I have the wiring diagrams from the Haynes manual which are nearly useless.
The wiring harnesses line up except for these things (I may have missed one or two)
1. the vacuum boxes on the rear firewall are different, and the harness connectors don't match.
2. there is a connector plug for a vacuum box on the DS that will now dangle because there is no vacuum box anymore.
3. the carb sensor wiring is different and the harness connectors don't match.
4. there is a sensor plug on the old motor right beside the oil pressure sensor on the back of the block. the new motor does not have the sensor so I have a dangling connector.
5. the old carb had an autochoke, the new carb does not. I am installing the manual choke from the donor car into the wagon. The manual choke has two wire connectors at the dash and I can't find equivalent loose wires in the wagon. Is this just for the choke dash light or does it notify any sensors?
6. the old motor had an 02 sensor in the exhaust manifold, the new one does not.
thanks in advance for any suggestions or help you can offer
I have the mechanical part of a motor/tranny swap done between 1985 CRX DX and a 1985 Civic Wagon DX that had the CVCC vacuum system. The mechanical swap was fairly easy but the wiring harnesses do not match. I am looking for some help/suggestions on how to deal with that.
First, is it is possible to just swap the old wiring harnesses over and plug the donor crx harness into the wagon plug receiver in the dash or would I need to change out the plug receiver? If so, do you feed the dash plugs through the firewall or pull the harness out of the engine bay through the firewall?
If not, I assume I have some splicing or extra wiring to do. If I need to splice and rewire, can I just look for wires in the harness that are the same colour as the donor connectors and tape off unused wires? Can I leave sensors I do not need any more unplugged or do I need to pull the harness plugs at the dash?
I have the wiring diagrams from the Haynes manual which are nearly useless.
The wiring harnesses line up except for these things (I may have missed one or two)
1. the vacuum boxes on the rear firewall are different, and the harness connectors don't match.
2. there is a connector plug for a vacuum box on the DS that will now dangle because there is no vacuum box anymore.
3. the carb sensor wiring is different and the harness connectors don't match.
4. there is a sensor plug on the old motor right beside the oil pressure sensor on the back of the block. the new motor does not have the sensor so I have a dangling connector.
5. the old carb had an autochoke, the new carb does not. I am installing the manual choke from the donor car into the wagon. The manual choke has two wire connectors at the dash and I can't find equivalent loose wires in the wagon. Is this just for the choke dash light or does it notify any sensors?
6. the old motor had an 02 sensor in the exhaust manifold, the new one does not.
thanks in advance for any suggestions or help you can offer