Quote Originally Posted by 57 Handyman View Post
Hey Anthony,

When I first started the motor, it was a fresh rebuild with all the internal engine mods. It ran just fine with the 4288 ECM. Then, something happened when I attached the ECM-to-PCM adapter I made as a means to hook up the 8625. I went the adapter route because I wanted to have an easy escape route to go back to the 4288 in the event I screwed up tuning the 8625. However, since the motor wouldn't start with the 8625, I decided to go back to using the 4288. Unfortunately, that is when all the problems with rough idle, struggling to stay running, and shutdowns/dying surfaced. These problems even persisted when I inserted the PROMs you sent.

Interestingly enough, for some reason, I don't get any check engine lights unless I disconnect a sensor.

lastly, I have not done any data logging because: (1) I am still learning how to get my computer to sync with the AutoProm, (2) then connect via the ALDL. Besides that, the motor won't stay running long enough to attempt any data logging.

If it isn't one thing, it is another...
This seems to be an important piece of the puzzle. Ran fine with '288 initially then like you said the problems came after the '8625. In one of your post, I noticed you said the E-fan kicked on 200dF. The data log you posted, yeah rich and engine temp never got over 140dF. Anyway, I have a few '747s that you can try out. The only V6 one I have is missing the PROM chip so I need to make one. I'll prolly burn the one you posted in one your threads. I can also bring my antiquated laptop and see if there's anything that seems amiss. Just let me know when the next time you're gonna go play!