Third Generation F-Body Message Boards - '90 F-body / Truck TBI ECM Compatibility

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'90 F-body / Truck TBI ECM Compatibility

I am working on a '90 P/U truck with a 5.7L TBI (engine code K), and a 1227747 ECM. Could I use a 1228746 f-body ECM (it's actually out of a '90 5.7L police car, engine code 7) in the P/U truck, or are there significant differences in the ECMs & harnesses?

With the stock chips, the 8746 runs a bit better than the 7747 with a GM 10134334 cam (235 deg @ 0.050", 0.480" lift i/e) installed in the 5.7L, although I need to bump up the idle & fix the over rich condition @ idle in the PROM.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

IAT, VATS, power steering switch, dual valve AIR, and can purge. The IAT and VATS will need to be addressed.

John