Good used factory GM engine control module (ECM) for the 1990-1995 Corvette ZR-1 with the 5.7L LT5 V8. The ZR-1 uses its own ECM, built only for the LT5.

• Fits 1990-1995 Corvette ZR-1 (LT5) only.
• Does not interchange with base-car ECMs. The L98 and LT1 ECMs plug into the ZR-1 connectors but will not run an LT5.
• Testing by LT5 specialist Marc Haibeck found that any-year ZR-1 ECM works in any-year ZR-1, as long as the MemCal (PROM calibration chip) for that car is installed.
• The factory part number on the unit we ship can vary. Please confirm you have the correct MemCal for your car before installing, and ask us if you need to know whether a MemCal is included.

Factory ZR-1 ECM part numbers: 1228331 (1990-1991), 16163993 (1992 to mid-1993), 16196394 (mid-1993 to 1995)

GM remanufactured service numbers: 88999186 (labeled 16163993), 88961142 (labeled 16196394)