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Yeah, even tho the rebuilt ECU was supposed to be plug-n-play, I did run across what you suggest, and tried it. No difference. Called company I bought it from, they said it should work immediately, so they are sending out a new one, it comes reset to factory default settings. Btw, have been...

Well, got the ECU today, plugged it in, now jeep running like crap. Think it is missing two cylinders...any thoughts? Was the old ecu covering up the problem or is the new one the issue? Ran fine before, other than not starting when cold...does a new ECU need to "adapt?"

Well, should have heeded the insights of others, but I figured since I know nothing about electronics, how hard could it be (same logic got me thru new transmission and clutch this summer, tho it did take a while)? Bottom line, I have a rebuilt ECU on order, no regrets, for $10 in parts, my kid...

Excellent write up. Guess I know how I am spending my Sunday...

So it is around 12:30 PM, turned it on and let it sit. Seatbelt light went out, about 10 seconds later, check engine and shift arrow flashed then went out. Started right up. So I guess the cold just makes it take longer to get enough energy as you suggested initially. Will prove out tomorrow AM...

Turns over, but will not start.

Still not starting, tried to follow your suggestion, here's what happened: 7 AM: Turned it on but did not turn it over, seatbelt lights go out, another 30 seconds, no check engine light, try to turn it over, will not start. Noon: Turned it on but did not turn over, seatbelt lights go out...

Still troubleshooting, but one thing that is interesting is when I try to start it when it is cold only the brake and seatbelt lights come on, not the check engine light. Later, when it is warmer, same thing, but after turning over for 15-20 seconds those lights go out, check engine light comes...

I have the exact same vehicle with the exact same problem, been troubleshooting it as well and I do think it is electrical (things contract when cold), tho have not figured it out yet..any resolution with yours?