Hey guys, longtime lurker and information leech here. I am installing a DIY TBI setup on a 1973 440 that's slightly warmed up and is currently living in a Jeep Wagoneer. I am using an early 454 TBI unit with the flat TPS connector and a '7427 PCM and harness that I got from the JY out of a 1994 G20 conversion van.
Here is where my confusion lies.
The BCC on the outside of the computer housing says BDSD. When I look that BDSD BCC up, I can only find it here:
http://www.scotthansen.net/BCCLookup.pdf
BCC |
Year |
Release Date |
Eprom |
ECM |
Prom ID |
Scan ID |
Platform |
Engine |
Displacement |
Trans |
Trans Type |
BDSD |
1994 |
33939 |
16188493 |
16168625 |
8494 |
8465 |
G1 |
LB4 |
4.3 |
M30 |
AUTO |
I am almost 99.9% positive the van in the JY was a V8, not a 4.3, but it has been a while. The actual memcal inside of the computer doesn't show a BCC on it, just numbers. Those numbers are: 4090 1617 4891.
The ECM is a 7427 but I noticed something was amiss when none of the 7427 wiring diagrams were matching up properly. For example, F9 for me is an orange/black wire, which seems to match the $OE wiring diagrams. That makes even less sense considering the computer case BCC says it's for a 4.3...which wouldn't have had a 4L80...
Basically, I'm just looking for some detective work help in trying to figure out exactly what I'm working with. From my reading the 7427 can run either $OD or $OE, and since my harness seems to match the $OE diagrams and I'm going to use a 7.4L bin to start my tuning, is it as simple as burning the $OE info to a chip and going from there?
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