Quote:
Originally Posted by gbrtng
My experience with a bad ECM: 2 or 3 unrelated error codes would set. As soon as the check engine lit, the engine would barely run or just stop and not restart. I could not isolate the problem to heat soak because it would happen at any outside and underhood
temperature. Replaced several ignition components with no change. Corey hooked up his Tech 1 and left baffled after an hour. I finally decided to change the ECM and yep, that was the problem. This was on Mary's 91 L98 which uses a common junk yard ECM - I was able to score one locally for $55 - which crosses to about 10 other GM vehicles.
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L98's had a well documented issue with ECM. Something about the board material being a bit flimsy and the circuits developing micro-cracks.
I'm in the "innocent till proven guilty"
camp when it comes to an ECM causing the kind of issues being discussed in this thread.