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Old 10-28-2017, 03:19 PM   #1
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90 sami computer?

I've eliminated the igniter, coil, and distributer and still no spark. What else is there? Could it be the computer? Any ideas how to check a computer? Thanks
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Old 10-28-2017, 09:39 PM   #2
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Send the computer off to have someone try it out on theirs. I only have knowledge of the Trackers but would think they are would be somewhat similar. Early Track/kicks have capacitors in the computer that go bad, then no worky. These can be replaced. Once my Tracker died as I pulled off the freeway. Turned out to be a main fuse, one over the pass wheel well, close to the battery. Large square one with a clear top.

I apologize in advance if any of this was covered already but would like to see you get it going. Check fuse box for ignition fuse, check grounds thoroughly, ensure 12v to coil, dist, etc. We know the igniter is good, is the coil? Maybe something in the dist, I read recently something about rotor being wrongly installed somehow. Look it over carefully in there. I am fairly sure I don't have any literature on the injected Sami but will look tomorrow.
Wish i could be of more help or at least some help.
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Old 10-29-2017, 08:28 PM   #3
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Does the dist. have power coming from the computer? What does the blue and red wire from the dist to the computer yellow plug do? What do the other two do? How do you check if the computer is ok? I am stumped. The book schematic doesn't show much on the 90 sami.

Last edited by lizardtrack; 10-29-2017 at 08:35 PM.
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Old 10-30-2017, 03:44 PM   #4
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In my experience, the computer/ECM is more failure prone than the ignitor, coil, distributor, or any other electrical EFI component. I think every samurai EFI ECM I have ever had has needed rebuilt at some point (capacitors replaced and circuit board traces repaired).
The only sure fire way I know of testing is to try the ECM in another EFI samurai that runs properly.
There is a Samurai EFI supplement floating around that describes how to test various EFI components and what should be on each ECM pin (voltage, ground, resistance, etc.) in various key positions.
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Old 11-18-2017, 07:00 PM   #5
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I finally got it. A member here sent me a computer to try, bingo it ran fine. I sent mine to be rebuilt for $75, should be here in a couple of days. Hopefully it will get here before the snow. I appreciate all the help.
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Old 11-18-2017, 07:48 PM   #6
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Really glad to hear you got it going!
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1987 tintop, VW 1.6td, Giles Super Pump, 5 speed, 6.5, yj's, e-lockers, 33's on Yotas.
1992 Tracker 31x10.50's, welded rear , 2" body, 2.5" RRO susp lift.
2-LJ10's
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Old 11-20-2017, 05:10 PM   #7
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I sent it out mon. got it back the following mon. FOR $75 it runs fine now. Ready for the snow.
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Old 12-10-2017, 10:08 PM   #8
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update

We just got close to 2 feet of snow in the last 3 days. The old zuki did its usual great job plowing the driveway. You should have seen the Buffalo Bills game today. It showed our wonderful weather.
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