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What year is this Reatta? 90,000 miles is low, and for most mechanical issues you could be in a good place. I drive a Reatta everyday, but have invested in numerous parts for inventory. I have an extra; water pump, serpentine belt, alternator, radiator, ECM, BCM, Mass Air Flow sensor, Idle Control sensor, spark plugs, wires, Ignition Module/coil pack, throttle body, power steering pump, Crank sensor, Cam sensor, Oil Pressure sensor, Fan module. These are items that used to be stocked at Automotive Parts houses, but not anymore, so at least a 1-2 day wait. Then there are the Reatta only items, Touch screen [88/89 year] Temperature Control module, Instrument Panel, Steering column, Headlight switch, Headlight Motor, Teves Accumulator, Teves Pressure Switch, Wheel Speed Sensors. Jim Finn usually has all the Reatta exclusive parts at fair prices but he is at least a 3-4 day turn around. About the only things that are common and same day pick up is fuses and relays. Oh and by the way make sure that both front and rear struts are in good shape. They are hard to find with some of guys here trying to come up with alternate products for these discontinued items. So either build an inventory to be able to drive every day or have alternate transportation available.

The 3D plastic printed adapter arrived today. it sides snugly over the Monroe 71801 Riviera struts that I have (which use the same body as the 71966, but with the addition of an air spring bladder). At the time, I made an assumption on the gland nut diameter being 48mm, however DPS.01 has since determined it is M51-1.5 diameter and thread pitch. I am going to have the top mount sleeve adapter printed in plastic for proof of concept of that so the stack up for the OEM bushings and retainers can be determined. Threaded end view (top) and slip end view (bottom). The resolution of the printing makes everything look threaded, but it is not. The threads are 1.5" deep which should allow for everything to come back to OEM suspension stroke, as the 73305 insert cartridge has 0.375" more stroke than the 71966.

That is the latest Prom for 1990 California only. I don't know how they differ from the Federal specs but all years have Cali only Proms.

There is a list of PROMs here on ROJ but I don't see one exactly like yours on it. ECM PROM List I wonder if you might have the wrong one for your car. Maybe someone more knowledgeable than me on PROMS will know.

Only current codes show as codes in the initial display screen, history do not count. They are cleared manually or by battery disconnect. I don't recognize that wire but it appears to be connected to something under your thumb? The ECM has no connections like that, just the two black and one orange harness plug. If you don't get a check engine light, no code is registered. If you disconnect the MAF for example, it probably won't set a code unless the trouble light is on and you check for codes then. If you disconnect and reconnect, it may or may not show a history code. Many sensors have a duration component before it will set a code. For example, something like the ecm registers engine rpm but no MAF reading for 10 seconds or something like that. Did you determine which Memcal you have? GM was constantly tweaking on them to improve or correct possible faults so multiple Proms are available for each year.

Here is my 2 cents on buying a Reatta and looking for dependable transportation. 1. Be ready to spend $$ for repairs as they will be inevitable on a 30 year old car. 2. Be prepared to get your hands dirty for various do-it-yourself repairs 3. Have access to alternate transportation as needed 4. Be thorough on reviewing all repair receipts provided by the seller 5. Pass on any car with rust or damaged windshield 6. Good luck and keep your fingers crossed !!!

It's no different than starting after the battery has been disconnected, which should be done before plugging and unplugging the ECM. It will be starting from a clean slate and will need to learn the various adjustments needed for optimal operation, which does take a little time. Key recognition is not part of the ECM's duty so it should start and run and then take for a drive.