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It is working like new on my 89.

Just something stupid but the ALDL connector cover under the dash closed ? It completes the LAN loop.

This is an excerpt from my engine build and s/c addition. If any of you read that long affair, I had on and off poor running, failure to start, perfect running and loss of data on the dashboard all mixed together, but all centered around the PROM and ECM: "Update on the control system problem which pretty much confirms my previous post about the chip being bad or unable to communicate. Acting on Ryan's suggestion after receiving some new chips, I loaded the problem child S/C 1.4 tune on a new chip. After installing, the car started and ran perfectly. Going through diagnostics while the engine warmed up, everything looked normal. When it reached closed loop, there was a change in the sound of the engine, but it all went smoothly. I then shut down and installed the suspected problem chip and even though it started immediately, I could tell something was "off". Going to diagnostics showed "no ECM data" again, so I suspect it is running in a limp mode. According to Ryan, this means the ECM cannot communicate with the chip. All this chasing the tail of the real problem, looking in the wrong place and blaming the Memcal or the Moates adapter, was at least instructional although time consuming." Maybe I can iron out some of the small details before it is time for it to sleep for the winter.👍

It would really help if you supplied pics of the 2 Reattas.