Cadillac Powertrain Control Module (PCM) Tuning Discussion, Does anyone have the broadcast code? in Cadillac Engine Technical Discussion; Does anyone have the broadcast code for the following ECM's?
I am wanting to look at ...
RE: the 1990-95 4.9 PFI, I may me interested in doing some tuning down the road sometime, not a priority for me immediately though. I do not have the info you are requesting, but I have a copy [somewhere] of the ALDL 8192 datastream spec for this engine that was done by someone else a while back that I found online while working on something else.
This may reveal the broadcast code you are seeking. I will try to track it down (it should be on one of my other computers that has been temporarily mothballed) and send you a copy if you are interested once I find it.
BTW, What kind of PROM is used in the 'lac 4.9 PCM? I assume a 27C256 or 512 as would be standard for a GM unit? Just curious.
Doesn't seem like many people are too concerned about doing this application. Mostly the Fiero crowd using it in their cars, though I'd think those with older eldo's and sevilles that had the 4.9 would have some interest. Mine is a Deville, and while I'd like a bit better fuel economy (which can probably be achieved by other means), I know it'll never be usable as a "high-performance" vehicle so I'm not looking to hot rod my car.
Now, if I could get 10-15 extra HP (realistically) without killing the fuel econ, I'd probably do it. As it is, I am satisified with the engine performance on this car. Plenty of power and torque to spare, and I'm not racing it so PCM tuning isn't a major priority for me, even if I find the prospect interesting.
FWIW, I have been thinking about getting a PROMmer, as I am wanting to dump the IPC firmware to see if I can do some mods there. If I get one, I'll dump the PCM prom and send it to you. Of course, that'll probably be a few months from now, with my current budget.