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swapped zc wont start

Discussion in 'Civic and CRX - EF' started by 1stcar86z, Feb 8, 2010.

  1. 1stcar86z

    1stcar86z New Member

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    ok so i did a sohc zc swap in my 91 dx hatch civic project car. ANd i have run into a couple of problems. The first problem is the car is only getting spark to the 1st and 3rd cyl. THe dizzy is brand new.
    i bought my harness from hasport and they sent me the dohc zc harness. I didnt realize this until a while later because i was out of state working. But i took the dizzy and wired it up according to diagram. Nothing happened.
    I am wondering if there are some pins that need to be moved around at the ecu for the Dohc harness to work for the sohc motor.
    Ohh and i am running the proper ecu? its a pm 6
     
  2. jlicrx

    jlicrx Senior Member

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    the only difference between the SOHC ZC and DOHC ZC engine harnesses is the distributor connector - nothing is different at the ECU - the SOHC has a round 7-wire connector at the distributor and the DOHC has a rectangular 5-wire connector - in addition, the DOHC has another 2-wire connector which goes to the cylinder sensor on the end of the exhaust camshaft - to rewire the DOHC distributor connector to the SOHC connector, you need to swap a round 7-wire connector from the 88-91 CRX/Civic D16A6 or 88-91 CRX HF or 90-91 Integra B18A1 in place of the rectangular 5-wire connector - you need to remove the 2-wire connector that went to the cylinder sensor on the DOHC and incorporate those 2 wires into the round 7-wire connector

    the picture below shows the wire locations in the 2 connectors - before you remove the 2-wire cylinder sensor connector from the harness, mark which wire goes to the blue/yellow on the sensor and which one goes to the blue/green so that you can get them in the right locations on the 7-wire connector

    [​IMG]
     
    Last edited: Feb 8, 2010
  3. 1stcar86z

    1stcar86z New Member

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    ok well ive done that with 2 different dizzys. im starting to think its an ecu prob. because it is throwing code 8 and 9 and on both dist. Does that sound right? Is there any way i can check?
     
  4. 1stcar86z

    1stcar86z New Member

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    okay so i Replaced the ecu and it is not throwing code 8 and nine anymore but it still will not start. It is getting weak to no spark on intermittent cylinders. I have tested compression and mechanical timing on the the motor and thats all fine. There are new spark plug wires on it and a new dizzy.

    Please help I will answer any questions. I need to get this thing runniing. I am capable of running tests. ANy ideas guy really.


    I hate electrical.
     
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