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    91 civic code 4 dohc zc

    My son has a 91 civic that has had a dohc zc engine swapped in. The ecu is blinking code 4. I believe it is a 3rd gen dohc zc engine. The car is still obd0. The cam sensor (cyl/tdc) resistance measured 890 ohms ( suppose to be between 600 and 1,000), so that seems okay. Checked continuity...

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