Cal file wanted for L31/4x ignition support on 1MB PCMs?
Looking for a cal or bin file, that I feel as though I may have seen in the past, but I just
can't find in my collection.
First, I'll give everyone a bit of history, just to set the stage.
The project in question is my '70 Pontiac Bonneville w/ 455 & 4L80E. I'm presently running
it using a 12200411 PCM with '02 Van L31 code (OS 12212156) in 4x Lo Res mode. I'm
generating the 4x crank signal using a modified HEI distributor.
In parallel, I've been preparing to convert the engine over to 24x and CNP. I should have the
next revision of the 24x crank trigger wheel and sensor ready to try out in the next 4-6 weeks.
When I move to 24x and CNP, I may also make the jump from the 12200411 PCM to one of
the many 1MB 03-07 PCMs. I'm thinking the 12586243 may be a good choice - they're
plentiful in the junkyards around here and support DBC, which I'll retain for a while longer.
This is where I need help. Looking at some of the '04 calibrations I have, it appears that
this generation of PCM still has support for running in 4x Lo Res mode. The Installed Options
Matrix seems to still indicate this. Does anyone happen to have a cal or bin file for one
of the '03-07 1MB PCMs that was for operating the Vortec L31, or any equivalent engine
that would have still run in 4x Lo Res mode? I'm thinking it would have to come from
something like a Workhorse chassis based vehicle or motorhome.
Having this would let me fall back to using my 4x based ignition solution as needed on a
1MB PCM, while I shake the last of the integration issues out of the 24x hardware.
Thanks all - hoping one of you has this oddball calibration stashed away somewhere!
-Scott
