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1990 civic si ls vtec swap help

Discussion in 'Civic and CRX - EF' started by Daniel S, Aug 3, 2019.

  1. Daniel S

    Daniel S New Member

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    Hey guys I have been building an ls vtec for a bit now I am getting close to putting it in the car but cant wrap my brain around the wiring parts. I have an ob2 b18b1 block with a ob1 b16 head from a crx. my question is if I want to run a p28 obd1 vtec ecu what harness do I need to get? or can I just modify the stock one? any help is very appreciated.

    Stay safe out there
     
  2. jlicrx

    jlicrx Senior Member

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    with any swap, you always use the engine harness that came in the car and modify it as required - you simply purchase an OBD0 to OBD1 ECU jumper which will have the wiring for VTEC built in - the jumper will connect your stock chassis harness to the OBD1 P28 ECU - you will need to modify the existing engine harness for the OBD1 distributor connectors and the cooling fan switch connector - your B18 will have the MAP sensor on top of the throttle body whereas the existing MAP is on the firewall - you will need to extend the wires on the chassis harness for the MAP so that the connector will reach the throttle body - if you are using OBD1 injectors, you will need to eliminate the injector resistor box - actually, pretty simple
     
  3. jlicrx

    jlicrx Senior Member

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    you can also purchase a jumper for the distributor - makes it plug and play

    you will also need a 4-wire O2 sensor
     
    Last edited: Aug 4, 2019
  4. Daniel S

    Daniel S New Member

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    Thank you that helped so much
     
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