Originally Posted by BALLER
The 90 PCM and 90 harnass iare running the 93 sc engine fairly well right now. The trans is shifting okay since the 90 PCM is controlling thing much better than I would have expected. I will keep you updated as I go.
Did you rig the TV cable to the '93 Throttle Body? (i.e. transfer the bellcrank from the '90 throttle body and connect up the cable to the transmission.)
The car will move and switch gears without the TV cable, but the shifts will be very soft (might be a blessing in disguise, it will save you from yourself) The 1990 ECM doesn't control the transmission beyond the TCC lockup.
Also, what alterations have you made, or had made to the calibrator prom? Also, if you haven't rigged the boost valve, you may actually be running the motor as a Normally Aspirated motor at all times (in other words, the blower is spinning it'* little heart out, but not actually producing any boost pressure..it'* recirculating it back into the intake.)