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post #1 of (permalink) Old 11-09-2000, 04:17 AM
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Tracker ECM fried

I was letting my '90 Tracker warm up a couple of days ago and it was doing it's usual surging until it gets warm. It suddenly quit. When I got into it to restart it I could smell a burned electrical smell. It would not start after that. I borrowed a shop manual from a friend at a Chevy dealer and went through the checks. I found the computer was bad. Just for the fun of it I pulled the top off the computer and found that the corner of it was chared black and a part was burned in half. All the circuts that plug into the ECM ohmed out when I checked them as per the manual.
My question is, Has anyone else had a similar thing happen to them. Could it be related to the surging problem when it gets cold? I dont want to put another ecm in it to have it blow up again.
Thanks in advance.

1985 fullsize Jimmy 4x4, 1990 GEO Tracker 4x4
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post #2 of (permalink) Old 11-09-2000, 05:13 AM
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Re: Tracker ECM fried

I hope not! I have that same surging problem on my '90 samurai. What causes that?

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post #3 of (permalink) Old 11-09-2000, 04:36 PM
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Re: Tracker ECM fried

I have read a few post's from people with the same surging problem. So I will assume that it did not cause my ECM to blow up. I would still like to know for sure what causes the surge and what made my ECM explode. I love my Tracker but now I have lost confidence in it.

1985 fullsize Jimmy 4x4, 1990 GEO Tracker 4x4
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post #4 of (permalink) Old 11-09-2000, 08:54 PM
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Re: Tracker ECM fried

Bad ignition wires will cause intermittent "spikes" to hit the processor and burn the drivers out... A complete tune-up is a must do at every 30k... cut corners and pay the price!! Also, bad engine grounds will do this...
The surging is normal for all fuel injected 1.3 & 1.6 samis, kicks etc.. The processor is programmed to do this during warm-up to keep the engine from seizing while running at a constant speed with dissimilar metals warming up at different rates... I never did like the surging or "very" high idle associated with warm-up... It is not adjustable and you'll have to just live with it...

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post #5 of (permalink) Old 11-11-2000, 04:13 AM
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Re: Tracker ECM fried

Thanks for the info Rodnee. I also found an article that explains how the ECM works and it also gave the exact discription of what I found hapened with mine. You can find this article at
Its worth a read.

1985 fullsize Jimmy 4x4, 1990 GEO Tracker 4x4
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