94 and 95 were also kind of odd years for GM computers as they transitioned toward OBD2.
There are several groups of ECMs.
94-95 LT1,LT4,LTx: These can be tuned via TunerCATS ( link ) with the $EE definition and an ALDU1+CABL1 (94 – square ALDL style connector) or ALDU1+CABL2 (95 “D” shape OBD2 connector). These are typically the 16188051 ECM. APU1 also works for reflash on these vehicles. No chip adapter needed.
94-95 TBI: Unlike all other TBI ECMs (which use a G2 chip adapter) these ECMs are memcal like their TPI cousins and work with the G1 memcal adapter. Take the cover off the ECM and if you see a memcal, you probably have one of these. The 16168625 is an example.
94-95 W-body LQ1: uses the regular MEMCAL found in 1227165/7727/7730 ECMs, you can use the G1 adapter in these units also.
94-95 3800: Primarily use the 16183247 and subsequently a different style memcal is used than earlier ECMs. The 94-95 3800 powered regals use a similar ECM that is weatherproofed, the 16183428, but that ECM is specific to the 94-95 3800 Regals only. This family of PCMs have the little blue ‘box’ memcal that has the integrated knock sensing board. A G4 chip adapter is required for these, it’s shorter than the G1.
93-95 3100 vehicles (except for the A-bodies, which use a non-weatherproof version of the 94-95 LQ1 PCM) are all flash units. Unfortunately we don’t currently have a solution for these.
(Thanks to Robert Saar for his help!)