https://dev.z31library.com/index.php?action=history&feed=atom&title=Forums%2FZ31P%2Fz31-repairs-forums_electronics%2F1984_na_edu_problemForums/Z31P/z31-repairs-forums electronics/1984 na edu problem - Revision history2026-08-15T15:45:39ZRevision history for this page on the wikiMediaWiki 1.43.8https://dev.z31library.com/index.php?title=Forums/Z31P/z31-repairs-forums_electronics/1984_na_edu_problem&diff=5885&oldid=prevz31p_BrianH: Forum archive import (z31performance)2026-05-15T05:16:01Z<p>Forum archive import (z31performance)</p>
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|archive_url=/Z31performance_archive/forum/z31-repairs-forums/electronics/537425-1984-na-edu-problem.html<br />
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'''BrianH:''' <small>(2017-10-13 15:23:01)</small><br />
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I picked up an 84 na basket case as a parts car. I wanted to get it running to see what was good and what was bad.<br />
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After getting it to start, and run poorly, and spending hours cleaning connectors and testing sensors, I put a spare ecu in it. Miraculously, it starts and runs very well.<br />
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problem is, the ecu that runs good is an 88 na federal. I think there may be an incompatibility with the 84 o2 sensor, and the 84 injectors.<br />
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I'd like to drive it while I build my real car, so I need to source an ecu. Any advice? Rock auto has an a1 cardone remanufactured for 200$. Anyone use one of these and have good or bad results to report? Is there a better source?<br />
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'''Z_Karma:''' <small>(2017-10-13 18:27:27)</small><br />
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[http://redz31.suomiz.net/pages/fuel.html http://redz31.suomiz.net/pages/fuel.html]<br />
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You're OK on oxygen sensor compatibility, But you're using a high impedance ECU on low impedance injectors, you could potentially be sending them too much power and eventually short them out.<br />
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Drop resistors are the usual modification for running low impedence injectors on high impedence ecu's.<br />
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[http://redz31.suomiz.net/pages/fuel/resistors.html http://redz31.suomiz.net/pages/fuel/resistors.html]<br />
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(here is a archived version with the images intact)<br />
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[https://web.archive.org/web/20090224223710/http:/redz31.net/pages/fuel/resistors.html https://web.archive.org/web/20090224…resistors.html]<br />
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That's assuming you are running stock na injectors and they haven't been swapped for some unknown injector by a PO.<br />
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I wouldn't bother with a re-manufactured ECU for a parts car.<br />
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'''BrianH:''' <small>(2017-10-13 18:39:25)</small><br />
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I read about the injector difference, and just ran it for about 30 seconds just to test. I have very rarely experienced a bad ecu on these cars, but was running out of other causes. I have a JWT 4 bar for the real car, but it won't help here. I just ordered an 87 na ecu off ebay. Hopefully it will work ok.<br />
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'''bonfire79:''' <small>(2017-10-14 06:39:32)</small><br />
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if you end up needing another ECU, get with Steve over at [http://www.300zxpartsforyou.com www.300zxpartsforyou.com]<br />
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he has many ECUs all stock all years.<br />
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Bon</div>z31p_BrianH